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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## Rain Forests ##### This topic has 2 expert replies and 2 member replies ## Rain Forests Which of the following most logically completes the argument given? People in isolated rain-forest communities tend to live on a largely vegetarian diet, and they eat little salt. Few of them suffer from high blood pressure, and their blood pressure does not tend to increase with age, as is common in industrialized countries. Such people often do develop high blood pressure when they move to cities and adopt high-salt diets. Though suggestive, these facts do not establish salt as the culprit in high blood pressure, however, because ________. A. genetic factors could account for the lack of increase of blood pressure with age among such people. B. people eating high-salt diets and living from birth in cities in industrialized societies generally have a tendency to have high blood pressure C. it is possible to have a low-salt diet while living in a city in an industrialized country D. there are changes in other aspects of diet when such people move to the city E. salt is a necessity for human life, and death can occur when the body loses too much salt Narrowed to 2- how about we have a C vs D discussion, to never have the confusion again _________________ Please press "thanks" if you think my post has helped you.. Cheers!! ### GMAT/MBA Expert Legendary Member Joined 14 Jan 2015 Posted: 2667 messages Followed by: 122 members Upvotes: 1153 GMAT Score: 770 This is a classic causality argument. Essentially, weâ€™re trying to evaluate the hypothesis that a high salt diet causes high blood pressure. More specifically, we're looking for an explanation as to why the hypothesis might not be true. Think of it as an arrow diagram: high salt --> high blood pressure The most logical way to weaken this connection is to posit something else that is correlated with a high salt diet, and that is, in fact, the true culprit for high blood pressure. So weâ€™re looking for: something other than salt --> high blood pressure. Okay. These people in the rain forest community move to the city. They start eating lots of salt. Their blood pressure goes up. One could say that salt is the culprit. But one could also say that people in cities who eat high-salt diets also eat high-fat diets or high-sugar diets, and itâ€™s the fat or sugar thatâ€™s causing problems, not the salt. This is the idea that D is capturing. C, on the other hand, offers information that has no bearing on the argument. Of course itâ€™s possible to eat a low salt-diet in a city. But weâ€™re already told, in the question stem, that these folks from the rain forest adopt high-salt diets when they move to the city! We just want to know if itâ€™s the salt theyâ€™re consuming thatâ€™s causing their newfound medical problems. The notion that they could have consumed less salt if theyâ€™d wanted to doesnâ€™t shed any light on whether salt is the culprit for their high blood pressure. _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

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Thanks David!
Made me realize how i miss small details in the question stem! Need to work harder

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Happy to help! Those little details in the question stem are always the key with Critical Reasoning. I'll typically read the argument twice and consciously scan for those subtle nuances in the language that I'm sure I missed the first time.

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Save $100 off any live Veritas Prep GMAT Course Enroll in a Veritas Prep GMAT class completely for FREE. Wondering if a GMAT course is right for you? Attend the first class session of an actual GMAT course, either in-person or live online, and see for yourself why so many students choose to work with Veritas Prep. Find a class now! Legendary Member Joined 03 Feb 2014 Posted: 2063 messages Followed by: 133 members Upvotes: 955 GMAT Score: 800 Akhil, even if you didn't see that it was already established that after they move they are eating more salt, D would still be better. What we know is that they move and then experience increases in blood pressure. So do we care that it's possible to have a low salt diet? Maybe. So if we missed that detail in the argument we might wonder if C were key. It could be a consideration, but the increases in blood pressure do happen for some reason. So maybe it's possible to have a low salt diet, but it's also possible they don't choose that. So C is a little weak. At the same time, whether after moving to cities they have low salt or high salt diets, and even if we didn't know which it is, D would rock the conclusion. If all we were to know is that they moved and their blood pressures went up, D would make it clear that there are multiple types of dietary changes any of which could underlie the increases, and so the available facts could not be used to "establish salt as the culprit in high blood pressure." So D is the best in any case. Working hard, as you mentioned, is good. Yup. At the same time I realized recently that in addition to working hard, I need to cultivate in myself a greater affinity for the idea of working smart. So there's a thought too. _________________ Marty Murray GMAT Coach m.w.murray@hotmail.com https://infinitemindprep.com/ In Person in the New York Area and Online Worldwide • 5 Day FREE Trial Study Smarter, Not Harder Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

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