Answer:
Option C
Explanation:
Polio mystery section deals with the issue of “How polio affected people in America”. It was during the 1951, when there was no medicine for polio and it was affecting the unvaccinated children leading to rise of endemic. Prior to advent of medicine in 1955, it was determined that paediatric injections could had incited polio infection, thereby leading to paralysis.
Hence, option C is correct
