Which action is an example of a proxy war?

The correct answer is A. An example of a proxy war was during the Soviet invasion of Afghanistan in 1978, when the United States armed the Mujahideen to fight the Soviets on its behalf.

Explanation:

A proxy war is a type of war that takes place when two or more powers use third forces as substitutes, instead of facing directly.

Although superpowers have sometimes used entire countries as subsidiaries, it is usually preferred to use guerrillas, mercenaries, terrorist groups, saboteurs or spies to hit the opponent indirectly. The objective is to damage, dislocate or weaken the other power without going into open conflict.

Frequently, proxy wars are waged in the context of violent or underground conflicts on a large scale.  

Among the wars that are considered to have been proxy wars are the Korean, Vietnam and Afghanistan wars.