Answer:
A) Voluntary trade occurs only when all participating nations expect to gain.
Step-by-step explanation:
Voluntary trade refers to the trade in which the seller and the buyer possess full right and control on their choice of selling or buying the products. Such form of trade provides freedom to the individual to opt to work. Forced labor is not seen in this form of trade. The process of trading done between a seller and buyer gives both the parties a level of satisfaction in the exchange of the items.