Answer:
The correct answer would be option D, They choose a party.
Step-by-step explanation:
Political Parties are open to everyone who wants to join them. There is no hard and fast rule to join a political party. If you wish to join the party, just choose that party and join. For example, If someone wants to join a political party, he will choose the party. Suppose he chooses Democratic Party, he will simply join it. His all support will be for this party and he will vote for that party in the elections.