Why Are Parties Stronger in the Senate Than in the House

Why are parties stronger in the Senate than in the House?

A) Party leaders write all bills in the House, unlike Senate individualism.
B) Members are elected as partisans in the House, and not in the Senate.
C) There are more independents in the Senate, which undermines parties.
D) The parties run the House Rules committee, which has more control than in the Senate.
E) The parties are equally strong in the Senate and House, and there is no difference.