How Has It Been Possible for Republicans to Control the Congressional

How has it been possible for Republicans to control the congressional agenda virtually unopposed from 1995 to 2006?

A) Despite their small majority, the GOP had enjoyed unprecedented unity, which enabled them to pass nearly all of their bills during this period.
B) Even though the president was a Democrat, the president supported every measure that the House put before him.
C) The Republicans enjoyed large majorities in the House during this period and so had been able to pass most bills, regardless of party unity.
D) The Democrats had not been able to use their majority status due to their lack of unity, and so the Republican minority had been able to get their bills through.
E) Even though the Republican leaders had been relatively weak, the House as a whole acted in a united fashion, which overwhelmed Democratic opposition.