Answer:
D is the correct answer.
Explanation:
In the summer of the presidential election year, the political parties of the US conduct national convention to choose the presidential candidates. The presidential candidates are selected at the convention by the group of delegates from each state. First, the speeches are delivered then the demonstrations in support of each candidate. After this, the delegates vote for each state and the delegate. The candidate who receives the maximum delegate votes is chosen as the party's presidential candidate. Then the selected candidate chooses a vice-presidential candidate.
