Question

economic sanctions are mainly used to
protect domestic industries from international competitors
help domestic industries gain more business
punish nations for disobeying international law
encourage nations to give up their nuclear weapons

Explanation:

Economic sanctions are often imposed as a form of punishment on nations that violate international law, norms, or engage in activities considered unacceptable by the imposing countries or international community. While they can have other secondary - effects like influencing nuclear - related behavior, their main purpose is punishment for rule - breaking. Protecting domestic industries and helping them gain business are more related to trade protectionism measures like tariffs and subsidies.

Answer:

punish nations for disobeying international law