Why Is a Candidate's Moving to the Left or the Right

Why is a candidate's moving to the left or the right during the nomination phase both an advantage and a disadvantage?

A) It gives a candidate a more defined ideological position, but most voters pay little attention to ideology.
B) While moving to one end of the spectrum might motivate the party base during the nomination, it might actually alienate more moderate voters of the general election.
C) Such a move decreases divisions within one political party, but it provides banter for the media.
D) The general public, who usually views these moves as appealing during the nomination, feels differently when the candidates go to the debates in the general election.