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?
The reason why the vaccine is rarely used because
2) Not effective till one month
3) Administrating after the outbreak doesn't add any value.
We need to find out a option which solves one of these problems.
A. Rift Valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical to control it by using insecticides.-> Doesn't add any value for any of the reason.
B. When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from the countries affected by the outbreak -> Same issue as option A)
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 -> Doesn't add any value
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 -> Doesn't add any value
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.-> This option gives a way to to predict that outbreak is going to occur so this option solves the problem # 3 and hence the correct answer.
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