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Register now and save up to $200 Available with Beat the GMAT members only code • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code ## Strengthen CR This topic has 2 expert replies and 3 member replies prachi18oct Master | Next Rank: 500 Posts Joined 27 Apr 2014 Posted: 269 messages Followed by: 5 members Upvotes: 8 #### Strengthen CR Mon Jul 13, 2015 2:49 pm Airline: Newly developed collision-avoidance systems, although not fully tested to discover potential malfunctions, must be installed immediately in passenger planes. Their mechanical warnings enable pilots to avoid crashes. Pilots: Pilots will not fly in planes with collision-avoidance systems that are not fully tested. Malfunctioning systems could mislead pilots, causing crashes. The pilotsâ€™ objection is most strengthened if which of the following is true? (A) It is always possible for mechanical devices to malfunction. (B) Jet engines, although not fully tested when first put into use, have achieved exemplary performance and safety records. (C) Although collision-avoidance systems will enable pilots to avoid some crashes, the likely malfunctions of the not-fully-tested systems will cause even more crashes. (D) Many airline collisions are caused in part by the exhaustion of overworked pilots. (E) Collision-avoidance systems, at this stage of development, appear to have worked better in passenger planes than in cargo planes during experimental flights made over a six-month period. I stuck between A and C. Although C sounds more reasonable and close to what pilot is pointing to, if A were not true the pilot's argument will be weakened. How to eliminate incorrect options in such cases? Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums! zaidq1 Newbie | Next Rank: 10 Posts Joined 14 Nov 2015 Posted: 1 messages Top Reply Mon Sep 25, 2017 10:41 pm why is option d wrong ? ### GMAT/MBA Expert DavidG@VeritasPrep Legendary Member Joined 14 Jan 2015 Posted: 2459 messages Followed by: 115 members Upvotes: 1153 GMAT Score: 770 Top Reply Tue Sep 26, 2017 9:01 am zaidq1 wrote: why is option d wrong ? The pilot's argument is that crash-avoidance systems should not be implemented until they're fully tested. Essentially, in the argument between using old fully-tested systems and newer untested systems, the pilots prefer the former. The question of whether crashes are caused by exhausted pilots sheds no light on the importance of having fully-tested systems. In other words, the key question is whether a malfunctioning new system is likely to cause more crashes than it prevents, not whether pilot exhaustion is the culprit. _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

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zaidq1 Newbie | Next Rank: 10 Posts
Joined
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Posted:
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Mon Sep 25, 2017 10:41 pm
why is option d wrong ?

### GMAT/MBA Expert

DavidG@VeritasPrep Legendary Member
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Tue Sep 26, 2017 9:01 am
zaidq1 wrote:
why is option d wrong ?
The pilot's argument is that crash-avoidance systems should not be implemented until they're fully tested. Essentially, in the argument between using old fully-tested systems and newer untested systems, the pilots prefer the former. The question of whether crashes are caused by exhausted pilots sheds no light on the importance of having fully-tested systems. In other words, the key question is whether a malfunctioning new system is likely to cause more crashes than it prevents, not whether pilot exhaustion is the culprit.

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nikhilgmat31 Legendary Member
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Thu Jul 30, 2015 4:14 am
any mechanical device can fail. so eliminate A.

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