Two brothers played with their cousin. One brother later became quite

Two brothers played with their cousin. One brother later became quite ill, whereas the other did not. Which of the following provides the best explanation for this occurrence?

a. Difference in length of time exposed
b. Difference in how actively the children played
c. Difference in genetic inheritance between the two brothers
d. Difference in lifestyle between the two brothers

ESSAYBID ANSWER

ANS: C
Assuming the two brothers lived in the same household, the environment and the agent or infectious organisms are the same. The only difference could be between the two brothers themselves and their genetic inheritance.