Which is the best example of the seniority rule?

Question

A party whip encourages caucus members to vote for a bill supported by the party leader.

A party caucus decides who should be the Speaker of the House before Congress organizes.

A chairman decides the priority of each bill being considered by a standing committee.

A four-term senator is appointed to an important job over a first-term senator.

Answer 1

A four-term senator is appointed to an important job over a first-term senator.