Final answer:
Trade barriers are policies enacted by governments to reduce or block international trade, resulting in protectionism. These barriers aim to protect domestic producers from foreign competition, and they can take the form of tariffs, import quotas, and nontariff barriers.
Step-by-step explanation:
When a government legislates policies to reduce or block international trade, it is engaging in protectionism. Protectionist policies aim to shield domestic producers and workers from foreign competition. These policies take the form of tariffs, import quotas, and nontariff barriers. The correct answer to the question is c) Trade barriers.