Question

what is the primary focus of us national security policy?
○ invading hostile countries
○ reaching trade agreements
○ protecting citizens and the nation
○ building alliances with military leaders

Explanation:

The primary focus of a national security policy, including that of the US, is to safeguard the nation and its citizens from various threats (such as external aggression, internal dangers, etc.). Invading hostile countries is not a primary focus of security policy (it's more of a potential action in specific scenarios, not the main goal). Reaching trade agreements is related to economic policy, not national security. Building alliances with military leaders is a secondary or supporting action, not the primary focus of national security policy which is centered on protection.

Answer:

C. protecting citizens and the nation