B is a good answer i think
The correct answer is D) they draw votes away from each party.
Third parties are important in a political system because they draw votes away from each party.
The United States has a bipartition political system dominated by the Republican Party and the Democratic Party. When a third political party has been part of one election, it gives the US citizens another option to choose from. Third parties had played an important role in breaking up the dominance of these two major parties. They draw votes away from Republicans and Democrats, helping people to have a new perspective of the US affairs and conditions.
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