All of the Following Statements Concerning Congressional Committee Chairs Are

All of the following statements concerning congressional committee chairs are true EXCEPT this one:

A) Committee chairs have lost some of their power in the past thirty years.
B) Committee chairs serve at the pleasure of the party caucus and party leaders.
C) Throughout most of the twentieth century, the seniority system controlled the selection of committee chairs.
D) The use of the seniority system means that the member of the majority party with the longest service on the committee is selected as the chair.
E) Seniority is now irrelevant for the selection of committee chairs.