Respuesta :
the answer is B ...................................................
Answer:
B) breaking up major parties' dominance.
Explanation:
The United States has a two-party system. This means that two parties dominate the political arena: the Democratic Party and the Republican Party. However, third parties play an important role as well. In national elections, third parties often break up major parties' dominance. This is important, as it means that the presence of third parties helps keep the two party system in check and the parties accountable.