Answer:
B. They were used to attack civilian centers rather than military targets.
Step-by-step explanation:
The concept of total war is used in political science and international relations in order to describe a type of warfare in which all infrastructure and resources, including civilian ones, are considered legitimate military targets. Moreover, a country engaged in a total war will give priority to military concerns over any others. This was the case of the attack on Japan during WWII, as Hiroshima and Nagasaki were cities with millions of civilians, and not military targets.