Final answer:
The advantage of seniority in Congress is that it makes a congressperson more likely to get leadership in a committee. Therefore, the correct option is C.
Step-by-step explanation:
The advantage of seniority in Congress is that it makes a congressperson more likely to get leadership in a committee. Seniority is often used as a criterion for appointing committee chairs because it indicates the level of experience and expertise a congressperson has gained over the years. By becoming a committee chair, the congressperson gains significant influence and power over the legislative process related to that committee's jurisdiction.