Answer:
The correct answer is C: president and vice-president
Explanation:
The actual voting system in the United States for president and vice president is by Electoral College, so that the people only vote for a political party, mostly democrats and republicans, whose members are the ones that elect president and vice president. To complete this, the people do not choose directly the president and vice president, but they choose for the members of the political parties that most represent them and that they promised to vote for the candidates that the party represents and the people want.
