The leader of the senate is the sergeant at arms. the majority party whip. the majority party leader. the president of the senate.

the majority party leader

Explanation:

The leader of the Senate is the majority party leader within the house. As the Senate leader, this person is responsible for scheduling the daily legislative program and, along with the minority party leader, he or she creates the unanimous consent agreements that govern the time for debate. Since the 1920s, the Republicans and Democrats have been the first floor leaders of the U.S. Nowadays, the Republican Party is the majority party, and the Republican leader Mitch McConnell is serving as the Senate leader.

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explanation:

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."