The president has the power to appoint which of the following positions?

A) open Senate seats
B) all state Supreme Court justices
C) cabinet secretaries
D) open seats in the House of Representatives

The president has the power to appoint cabinet secretaries, who are the heads of the executive departments of the federal government. The other options are not within the president's appointment powers. Open Senate seats are filled through a special election in the state, state Supreme Court justices are typically appointed by the governor or elected by the state's voters, and open seats in the House of Representatives are filled through a special election in the congressional district.