In the Early Days of American Democracy, State Legislatures Chose

In the early days of American democracy, state legislatures chose electors who then cast two votes for president of the United States. Why cast two votes?

A) One vote was for their state and the other vote for the other states.
B) If voters rejected the electors' first choice, then the second place finisher became the winner.
C) If one candidate was ruled as ineligible, it would not be necessary to hold another election.
D) The candidate with the most votes became president, while the second-place candidate became the vice president.
E) To ensure that the vote totals were the same.