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 use of the 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 the 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 a 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 two to five months, by an outbreak of Rift Valley fever.
Let’s look at the argument given-
Premises-
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.
Expert’s Prediction
Nevertheless,
experts predict that the use of the vaccine will increase significantly within the next few years.
We need to look for an option that 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.
The fact that we cannot control the fever by using insecticides does not justifiy how the use of the vaccine will increase significantly within the next few years. The problems stated in the premise still hold. Eliminate.
(B) When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak.
Not relevant. Eliminate.
(C) It would take less than a month for producers of the vaccine to adjust their production operations to cope with a large increase in demand.
But will there be an increase in demand? Not sure. Eliminate.
(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.
This does not justify how the use of vaccines will increase, despite the problems stated. Eliminate.
(E) Recently published research has shown that certain identifiable climatic conditions are almost invariably followed, within two to five months, by an outbreak of Rift Valley fever.
A recently published article shows that certain identifiable climatic conditions are almost invariably followed, within two to five months, by an outbreak of Rift Valley fever.
Identifiable climatic conditions will help farmers know when to use the vaccine. This takes care of the problem stated- that the farmers have to use it routinely.
Option E justifies how the use of vaccines will increase in the next few years. Correct.