For presidential elections, the choosing/selection of delegates to the party national conventions is no longer being done at all; instead, presidential candidates are selected to represent a party on the basis of a nationwide vote. Which of the following has taken over the function of primary elections and grassroots caucuses but not of party leaders?
A) The function of primary elections and caucuses.
B) The function of party leaders and governors.
C) The function of party leaders and presidential primary elections.
D) The function of governors and members of Congress.