Hird parties play a significant role in the election process because they advocate .

A: Reform

Explanation:

In America, there are two dominant political parties as of now (Republicans and Democrats). This pattern of two dominant parties has been prevelant since the early to mid 20th century. However, when neither party is meeting the needs of certain American citizens, a third political party will begin to gain prominence. In the US we have seen this multiple times, including the development of the Progressive Party, Green Party, Libertarian party, etc