Final answer:
In cases where presidential candidates win only pluralities of the popular vote, the candidate with the plurality is declared the winner.
Step-by-step explanation:
In the case of presidential candidates winning only pluralities of the popular vote, the candidate with the plurality is declared the winner. This means that the candidate who receives the most votes, even if it is not a majority, is declared the winner. In this scenario, no runoff election or ranked-choice voting would take place, and the election would not be decided by the House of Representatives.