The correct answer is A) prepare and approve the party's beliefs
At the party's convention, delegates gather to draft the party's platform for the Presidential election and eventually work their way to nominate their candidate for that year's Presidential election.
A. prepare and approve the party's beliefs
At the national convention, political parties prepare and approve the party's beliefs. They do not nominate Senators for office, nor Supreme Court Justices. They do, however, nominate the candidates for President and Vice President.