The Median-Voter Theorem Would Suggest the Reason Politicians Go from Extreme

The median-voter theorem would suggest the reason politicians go from extreme to moderate positions on an issue over the course of an election is because they are:

A) appealing to the median voter in their party in the primary,and the median of all voters in the general election.
B) appealing to the average voter in their party in the primary,and the average of all voters in the general election.
C) appealing to the majority of voters in their party in the primary,and the majority of all voters in the general election.
D) None of these is true.