Final answer:
The Senate Majority Leader has the power to determine the importance of bills in the Senate, setting the agenda and prioritizing legislation. The correct option is 2.
Step-by-step explanation:
The individual with the power to determine the importance of bills in the Senate is the Senate Majority Leader.
While the Vice President serves as the President of the Senate and can vote in the case of a tie, their role is mostly ceremonial.
The President Pro Tempore presides over the Senate when the Vice President is not present, but this is also largely a formal role with limited power.
The actual power to set the agenda and prioritize legislation in the Senate rests with the Senate Majority Leader, who acts as the chief spokesperson for the majority party and works with the minority leader to move legislation forward. The correct option is 2.