Question: Which of the following accurately describes congressional committees? I. The committee chairpersons always belong to the majority party. II. Seats on each committee are divided between the two major parties in exact proportion to the parties' representation in Congress. III. They recommend whether Congress should pass various pieces of legislation, and those recommendations are always approved by the full congressional body. IV. When a committee vote results in a tie, the vice president casts the tie-breaking vote.
A: I only
B: II only
C: I and III only
D: II and III only
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option.