Which of the Following Is True of Primary Elections

Which of the following is true of primary elections?

A) Voters select the candidates of their party, who will then run in the general election.
B) Candidates who win general elections contest in primary elections.
C) Candidates who contest in primary elections are appointed by local party officials, who are usually called bosses.
D) Voter turnout is generally higher in primary elections than in general elections.
E) Voters are allowed to choose the candidates of more than one party.