Question

which of these is the strongest example of multilateral foreign policy?
one nation states publicly that it will refuse to trade with any nation that criticizes its leader.
one nation refuses to trade with a rival nation because it does not allow women to vote in an upcoming election.
two rival nations go to war with one another over disputed territory.
two allied nations enforce economic sanctions on a country until its government changes a key policy.

Explanation:

Multilateral foreign policy involves multiple nations acting together. The first option is a single nation's unilateral action. The second is also a single nation acting unilaterally. The third is a conflict between two nations (bilateral, not multilateral in the sense of cooperative action). The fourth option has two allied nations (multiple nations) acting together to enforce sanctions, which is multilateral cooperation in foreign policy.

Answer:

D. Two allied nations enforce economic sanctions on a country until its government changes a key policy.