How Did the Practice of Presidential Elections Change During the First

How did the practice of presidential elections change during the first party system in the United States?

A) As the Democratic-Republicans grew strong, its members in state legislatures coordinated to select the best candidate to represent the party in the presidential election.
B) The fragmented nature of the party system meant that Congress played a major role in choosing the President so this limited the influence of the executive branch.
C) As competing slates of delegates pledged to support specific presidential candidates, the candidates replaced individual electors as the objects of voters' decisions.
D) The Federalists organized the first national party convention to build popular appeals to the electorate.