Answer:
A. World War II and the Vietnam War
Explanation:
The war that John Steinbeck discusses in "Symptoms" is World War II. Steinbeck served as a war correspondent during this war, which allowed him to gain first-hand information on the situation of soldiers and veterans.
The war that Tim O'Brien writes about, on the other hand, is the Vietnam War. We know this because he describes being at My Khe. The Vietnam War was a war between North Vietnam and South Vietnam (with American involvement) between 1955-1975.
