Answer:
The correct answer is A. World War II and the Vietnam War.
Step-by-step explanation:
In "Symptoms", John Steinbeck, who was a WWII correspondant for the New York Herald Tribune, focuses on the effects of war on soldiers. O'Brien, on the other hand, focuses on the guilt of soliders and on the victims of war in a more sympathetic way. In "Ambush", O'Brien tries to come to terms with his actions during certain event during the Vietnam War, imagining that he tells her daughter the entire story of the ambush at My Khe.