Presidential Candidates Have Asked Individuals to Join the Ticket as Vice

Presidential candidates have asked individuals to join the ticket as vice presidential candidates for all of the following reasons except

A) to balance the ticket by region or political philosophy.
B) to attract groups of voters or appease party factions.
C) to reinforce one of the presidential candidate's strong points.
D) to shore up the presidential candidate's perceived weaknesses.
E) to serve as a co-president.