Question

in 1793, 5,000 people in philadelphia died of yellow fever in three months. based on this text, many deaths would have been prevented if people had
a known the disease was carried by mosquitoes.
b washed their hands more often with soap.
c spent more time outdoors in warm weather.
d tried to cure the disease by washing their feet.

Explanation:

Yellow fever is transmitted by mosquitoes. If people in 1793 had known this, they could have taken measures to avoid mosquito bites (like using mosquito nets, eliminating breeding sites), which would have prevented many deaths. Option B (handwashing) is for diseases spread by contact, not yellow fever. Option C (more outdoor time in warm weather) would likely increase mosquito exposure. Option D (washing feet to cure) is irrelevant as yellow fever isn't cured by foot - washing.

Answer:

A. known the disease was carried by mosquitoes.