Why May a President with a Large Majority in the House

Multiple Choice

Why may a president with a large majority in the House and a good working majority in the Senate still struggle to get bills through Congress?

A) It takes a two-thirds majority in both chambers to override a presidential veto.
B) It takes 60 votes to break a possible filibuster in the Senate.
C) It takes 80 votes to break a possible filibuster in the Senate.
D) The House Rules Committee assigns an equal number of majority and minority party members.
E) A single member of the House can put a hold on legislation by request.