who selects U.S. presidential candidates?

There is a primary election, state caucus, which leads to the national convention of each party. This usually starts a year prior to the presidential vote. That way the strongest candidates have enough time to raise money, and then spread their agenda ideas, propaganda, and political views, and perform debates by means of party affiliation.

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Voters.

All of the other answers are wrong.

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The political parties the candidates are from.