In addition to replacing the president if necessary, it's the duty of the vice president to

A. review laws before the president signs them.
B. serve as Speaker of the House.
C. preside over the Senate.
D. serve as liaison to the judicial branch.

Respuesta :

Hagrid
In addition to replacing the president if necessary, it's the duty of the vice president to

C. preside over the Senate

This is according to the US Constitution. The vice president can also be appointed as member of the Cabinet if decided by the president.
its C preside over the senate