Which of the following is NOT a type of U.S. foreign policy?

The correct answer is C, which identifies environmental regulation as not being a type of U.S. foreign policy. U.S. foreign policy primarily revolves around how the country interacts with other nations, which encompasses military/defense strategies, intelligence operations, and diplomacy.

Military/defense policies are concerned with the protection of national security and may involve strategies for warfare, alliances, and military assistance to allies. Intelligence plays a crucial role in foreign policy by gathering and analyzing information about other countries to inform decision-making and assess threats. Diplomacy involves negotiation and building relationships with other nations to achieve national goals, maintain peace, and resolve conflicts.

Environmental regulation, while it may influence or be a topic within foreign relations—especially in addressing global issues like climate change—is not classified as a direct component of foreign policy. Instead, environmental regulation is more related to domestic policy aimed at managing a country's natural resources and environmental impact.