Final answer:
Cloture is the procedure used in the Senate to end a debate and bring a bill to a vote.
Step-by-step explanation:
The correct answer is a. cloture. Cloture is the procedure used in the Senate to end a debate and bring a bill to a vote. It requires a three-fifths majority, or 60 votes, to invoke. The purpose of cloture is to overcome a filibuster, which is a tactic used to prolong debate and prevent a vote. Once cloture is invoked, debate on the bill ends and the Senate can proceed to a final vote.