Final answer:
The form of protectionist policy among the listed options is quotas, which are governmental limits on the quantity of imports to protect domestic industries. The correct option is D.
Step-by-step explanation:
Among the options provided, the correct form of protectionist policy is quotas. Protectionist policies are measures taken by governments to restrict international trade and protect domestic industries from foreign competition. These policies can take the form of tariffs, import quotas, and nontariff barriers.
A patent is a intellectual property right granted to an inventor. Bribes are illegal payments, and foreign direct investment is the investment by a company in the business interests of another country, in the form of either establishing business operations or acquiring business assets.
Thus, option D, quotas, is the accurate answer as it directly relates to governmental limits on the quantity of imports. The correct option is D.