Um? Am I supposed to do something here??
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.
I think the answer is either a or c
The clause is really a state's rights clause. A state may not pass a law that makes something illegal that was legal before the law was passed. In other words if a state suddenly passed a law that said it is no longer legal to park your car in front of any government building, but it was legal to do so yesterday, the police cannot come to your door and issue a ticket for parking in front of a government building because you did it yesterday.
The constitution actually uses the phrase ex post facto law in Article 1 Section 10 Clause 1.
