The section "Polio Mysteries" helps readers understand * 14 points A. How polio can be treated. B. What causes polio. C. How polio affected people in America. D. Why polio is so contagious.

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

do you have options?

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.