Because of polarization among americans, the parties are more likely to nominate candidates who are ?
a) moderate
b) independent
c) centrist
d) ideologist

D. Ideologists.
Typically parties will prop up people who can convey a convincing ideal that their particular party has, whether it be for better or worst. This typically results in further members of their own party voting for them, and possibly independents (centrists) and people in the other aisle joining them due to a common ideal that candidate represents that perhaps another candidate can not support.

Answerglycogen;