​As Parties in Congress Have Become More Polarized,____________________

​As parties in Congress have become more polarized,____________________.

A) ​the middle ground has expanded, offering greater space for compromise
B) ​compromises have become harder to achieve
C) ​the president has become the "compromiser-in-chief" in a way that is new for American democracy
D) ​members of parties have started to respond to the resulting public distrust of Congress with increased attempts to reach across the aisle
E) ​they have become more able to work with members of the opposition