In which situation is U.S. military power typically called upon?

The correct choice focuses on the role of U.S. military power in safeguarding American citizens outside the U.S. When events arise that threaten the safety of Americans in foreign countries, such as political instability, civil unrest, or terrorism, the military can be deployed to ensure their protection. This has been evident in various historical instances where U.S. forces have been utilized for evacuation operations or to stabilize regions in which Americans are at risk.

While monitoring international trade flows, defending against cyber attacks, and increasing economic sanctions may involve federal agencies and diplomatic efforts, they do not typically necessitate a direct military response. Military power is primarily employed as a means of last resort, focusing on the protection and security of individuals and interests abroad when other measures are inadequate.