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.


I picked D

i would like to know why is not D and the real level of this question based on your judgment. I supposed the tag

Thanks
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KUDOS is the good manner to help the entire community.

Pretty Clear
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KUDOS is the good manner to help the entire community.

I agree with this level because for me the argument was straighforward. Simply, I picked the wrong question and sometimes (rarely) I do not understand my mistake.

This question came after a drill of 50 CR in a row.........may be I was tired
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KUDOS is the good manner to help the entire community.

Nope, the option says the climatic conditions were followed by the outbreak of the Rift Valley fever.
Hence , this makes option E correct .
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You want something, go get it . Period !

Decode this part of premise and you will be through " it is not effective until a month after vaccination"
<< Vaccine is effective only after a month of vaccination, Hence to make it effective, livestock should be vaccinated atleast a month in advance of the outbreak, But "do we know the time of vaccination">>>

Conclusion : Nevertheless, experts predict that use of the vaccine will increase significantly within the next few years.
We need to support

If the use of vaccine will increse that means both the prob i.e. the cost or the time is going to be eliminated or either
Look for an option that solves the problem

E says that the 5 months before the identifiable climate hence the time is known

Hence E supports