Who is the Secretary of State?

The correct choice is the Honorable Mike Pompeo because he served as the United States Secretary of State from April 2018 until January 2021. In this role, he was responsible for shaping U.S. foreign policy and representing the United States in diplomatic matters. The Secretary of State's position is one of the most important in the U.S. government, as it involves overseeing the Department of State, managing international relations, and communicating the country's foreign policy goals.

The other individuals listed do not hold the position of Secretary of State. Kirstjen Nielsen served as the Secretary of Homeland Security, focusing on issues related to national security and immigration. MCPON Russel Smith, or Master Chief Petty Officer of the Navy, is a senior enlisted sailor, while Rear Admiral Terry Moulton served in a different capacity within the Navy. Their roles are significant within their specific domains, but they are not connected to the position of Secretary of State.