Which choice best describes the reasons behind jonas salk's decision to search for a cure for poliomyelitis?

Explanation:

When Salks presented the vaccine to stop poliomyelitis, the situation was really critical. From the 58,000 cases, 3,145 died and 21,269 were affected with paralysis, that's how critical was the situation.

Also, Jonas Salks dedicated part of his life to this issue, because he refused to work in a hospital, his motivation was do research.

This problem is considered as the biggest public health problem in the post war era.

a. the man as a ruler

the correct answer is d. in john paston's letter written friday, 14, 1476, he expresses his fear that he may have to go to war.

indeed, although the black death was ravaging europe, the pastons were relatively safe from it due to their social status as they were part of the landed gentry. it is clear that the vast majority of the victims of the pandemic were the poor. the reason why he is weary of having to go to war is because at the particular time england was also devastated by the war of the roses and paston, being a courtesan was inevitably involved.