Which of the following is a war strategy to beat an opponent by cutting off their supply chain?

Siege

Explanation:

A SIEGE is a form of military strategy in war, whereby an enemy is encircled and all supplies including food, war mercenaries, weapons, etc, are cut off. The purpose is to force an enemy to surrender. This war strategy is very common in ancient times, where building wall surrounding the cities is a form of war defense.

Hence, SIEGE is a war strategy to beat an opponent by cutting off its supply chain.

the answer is c my brotha. c.   formed an alliance with the soviet union.

answer; taking up arms to defend the nation;