What items are usually considered contraband in war?

contraband items in war are items that may Aid the military opposition like Guns and bombs ( weapons of war )

Explanation:

Contraband in terms of war is an international law that empowers a nation to stop and seize shipments made from a country not involved in the war to another country that is actively at war with the nation empowered with such belligerent rights.

These contraband item inside the shipments are usually military equipment which will help the enemy country have an edge during the war.

by creating a labor shortage that pushed the continent toward a market economy

i would say your answer is a)

sorry if im wrong