Who elects the vice president of the United States?

Answer 1

Vice presidents are usually elected jointly as a running mate to the president. The electoral college elects the President and the President chooses the Vice President.

a Presidential candidate selects "their" own V.P, but is nominated and elected by party convention

Answer 2

The President and the VIce-President run together, as a team, on the same ballot and are elected by the citizens in an election.

If you actually meant to ask who SELECTS the Vice President, then that would be done in the convention of the political party to which the Presidential candidate belongs.

Answer 3

The vice president is formally elected by the same electors who elect the President. When the people vote for President they also vote for the vice-president since the candidates for these positions run as a team. The vice-presidential nominee is chosen at the same party convention as the the presidential nominee. In recent years, the presidential nominee has picked his running mate and the convention then approved his choice. In past years, many of the nominees would leave the choice of his running mate up to the convention.