Why Is a Candidate Moving to the Left or the Right

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

A) It gives a candidate a more defined ideological position, but even the slightest shifts will certainly be called flip-flopping.
B) While moving to one end of the spectrum might motivate a party base during nomination, it might actually alienate more moderate or on-the-fence voters of the general election.
C) Such a move decreases divisions within one political party, but it provides banter for the media.
D) Extreme views give candidates the edge, but it also means that they are forced to hold true to that message throughout the campaign.
E) The general public, who generally view these moves as appealing during nomination, change their minds when these candidates go to the debates after nomination processes.