The Model Predicting Victory in a Two-Person Race for the Candidate

The model predicting victory in a two-person race for the candidate closer to occupying the center of the voter distribution is built on the assumption that

A) people always vote for the Democratic candidate if they are Democrats and for the Republican candidate if they are Republicans.
B) people vote for the candidate who comes closer to matching their own views.
C) most people don't vote unless the election is predicted to be close.
D) most people don't vote unless the election is predicted to be a landslide in favor of one candidate.