From GMAT paper of Manhattan Review guide.
Q. Outbreaks of rift valley fever occur irregularly in East Africa, several years apart. When outbreaks do occur, they kill thousands of cattle. A livestock vaccine against the disease exists but is rarely used. It is too expensive for farmers to use routinely, and since it is not effective until a month after vaccination, administering it after an outbreak begins helps very little. Nevertheless, experts predict that the use of vaccine will increase significantly within the next few years.
Which of the following if true, provides the strongest justification for the experts' prediction?
a. Rift valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.
b. When an outbreak of rift valley fever occurs, unaffected countries often refuse to import livestock from countries affected by the outbreak.
c. It would take less than a month for producers of the vaccine to adjust their production operations to cope with the large increase in demand.
d. Many cattle farmers in east Africa are nomadic or live in remote villages, and such farmers, who have little access to modern veterinary medicine, are particularly hard hit by outbreaks of rift valley fever.
e. Recently published research has shown that certain identifiable climatic conditions are almost invariably followed, within 2 to 5 months, by na outbreak of Rift valley fever.
The correct answer according to our instructor is e
Here is how I worked it out.
[spoiler]a:[/spoiler] If this is true, farmers will use the vaccine now they will not wait for few more years. Hence incorrect
[spoiler]b:[/spoiler] What the livestock are used for is beyond the scope. Hence incorrect
[spoiler]c:[/spoiler] Adjustment in prod operations CAN cause the cost to come down. but since it is not effective until a month after vaccination its of no use. Hence partially correct
[spoiler]d:[/spoiler] The passage doesn't suggest anything about the nomadic farmers settling down in future. Hence irrelevant.
[spoiler]e:[/spoiler] Even if farmers come to know about the outbreak of the fever in advance, if the vaccines are expensive they cannot afford it. Hence partially correct.
Can anyone please explain what makes e a better option than c
Q. Outbreaks of rift valley fever occur irregularly in East Africa, several years apart. When outbreaks do occur, they kill thousands of cattle. A livestock vaccine against the disease exists but is rarely used. It is too expensive for farmers to use routinely, and since it is not effective until a month after vaccination, administering it after an outbreak begins helps very little. Nevertheless, experts predict that the use of vaccine will increase significantly within the next few years.
Which of the following if true, provides the strongest justification for the experts' prediction?
a. Rift valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.
b. When an outbreak of rift valley fever occurs, unaffected countries often refuse to import livestock from countries affected by the outbreak.
c. It would take less than a month for producers of the vaccine to adjust their production operations to cope with the large increase in demand.
d. Many cattle farmers in east Africa are nomadic or live in remote villages, and such farmers, who have little access to modern veterinary medicine, are particularly hard hit by outbreaks of rift valley fever.
e. Recently published research has shown that certain identifiable climatic conditions are almost invariably followed, within 2 to 5 months, by na outbreak of Rift valley fever.
The correct answer according to our instructor is e
Here is how I worked it out.
[spoiler]a:[/spoiler] If this is true, farmers will use the vaccine now they will not wait for few more years. Hence incorrect
[spoiler]b:[/spoiler] What the livestock are used for is beyond the scope. Hence incorrect
[spoiler]c:[/spoiler] Adjustment in prod operations CAN cause the cost to come down. but since it is not effective until a month after vaccination its of no use. Hence partially correct
[spoiler]d:[/spoiler] The passage doesn't suggest anything about the nomadic farmers settling down in future. Hence irrelevant.
[spoiler]e:[/spoiler] Even if farmers come to know about the outbreak of the fever in advance, if the vaccines are expensive they cannot afford it. Hence partially correct.
Can anyone please explain what makes e a better option than c
