Which of the following could be used by a Republican senator to block a bill proposed by the Democratic majority in the Senate?

A. Rule 22
B. The Rules Committee
C. The cloture vote
D. The filibuster
D?

Yes, the filibuster.

Yes, option D. The filibuster, could be used by a Republican senator to block a bill proposed by the Democratic majority in the Senate. The filibuster is a parliamentary procedure where a senator or a group of senators can prolong debate on a bill, effectively delaying its passage. By speaking for an extended period of time without yielding the floor, they can prevent the bill from being brought to a vote. This tactic can be used as a way to obstruct legislation and require a supermajority of 60 votes to end the filibuster and proceed to a vote. It is commonly employed as a tool for minority parties to stall or block bills supported by the majority party.