Why Was President Obama Able to Put Together a Substantial

Why was President Obama able to put together a substantial legislative record in his first two years?

A) Congress enacted the presidential ability to use a line-item veto.
B) Congress temporarily agreed to fewer programmatic requests.
C) He convinced moderate Republicans to support his agenda.
D) He had bigger and more cohesive party majorities in Congress.
E) He used his veto power more than any other president in his first term.