Why Were Republicans Able to Pass So Many Laws After

Why were Republicans able to pass so many laws after they came to power in 2001 in spite of their small majorities in Congress?

A) The Republicans were disciplined and acted out of party unity, so they were able to control the legislative agenda.
B) The Democrats were distracted by 9/11 and focused on terrorism, so they did not pay much attention to what the Republicans were doing.
C) The president was Republican, so the legislators had his full support for their programs, especially after 9/11.
D) The president was Democrat, but the Republicans were extremely focused, disciplined, and displayed remarkable party unity.
E) The Democrats had no party unity and tended to be undisciplined, so the Republicans could control the agenda.