One Implication of the Median Voter Model Is That Candidates

One implication of the median voter model is that candidates running for political office take polls because

A) everyone does it.
B) they want to know if they should maintain their current positions or modify them.
C) it is good public relations, since if the public learns that the candidate is taking polls, the public will feel that the candidate cares what it thinks.
D) taking polls is tax deductible.