Question

an official government order that limits trade with another nation to punish or pressure that nation in some way is known as
an act of war.
an embargo.
isolationism.
appeasement.

Explanation:

An embargo is a government - imposed restriction on trade with another nation for punitive or pressurizing purposes. An act of war is a military action. Isolationism is a foreign - policy stance of staying out of international affairs. Appeasement is giving in to an opponent's demands to avoid conflict.

Answer:

B. an embargo