Answer: A. Many peacetime diseases are really caused by wars, as returning soldiers spread diseases they acquired while fighting.
B. The deadliest war of all time as World War II, which resulted in more than 50 million deaths around the world.
C. Since the start of the 20th century, armies around the world would have developed more destructive weapons than ever before.
D. It doesn't make sense to even talk about diseases when wars are obviously much miss important to human history.
Step-by-step explanation:
Apex