A Direct Consequence of the Election of 1800 Was the Constitutional

A direct consequence of the election of 1800 was the constitutional amendment stipulating

A) a single electoral college ballot in which the candidate with the most votes became president and the runner-up became vice president.
B) the organization of political parties.
C) separate electoral college ballots for president and vice-president.
D) qualifications of those who could vote for presidential electors.