Which of the following is a Cabinet-level position?

The position of Secretary of Health and Human Services is a Cabinet-level role, which means it is part of the President's Cabinet and is responsible for overseeing the federal government's policies and programs related to health and social services. This position plays a crucial role in public health, welfare, and the administration of health programs. It operates at a high level within the executive branch, directly advising the President on issues that impact health and human service policies, implementing laws related to health care, and managing agencies such as the Centers for Disease Control and Prevention (CDC) and the Food and Drug Administration (FDA).

In contrast, the Chief Justice is the head of the judicial branch and does not hold a Cabinet position. The Ambassador to the United Nations is a significant diplomatic role but is typically not classified as a Cabinet position. Finally, a State Senator holds a position within the legislative branch at the state level and is not associated with the federal Cabinet. Therefore, the Secretary of Health and Human Services is the correct answer as it represents an official in the federal executive structure, directly involved in governance and policy implementation at a national level.