Third parties in the United States typically represent

A) extremist religious groups.
B) recent immigrants.
C) the political interests of America's allies,who attempt to influence the American decision-making process because U.S.policies can affect their futures.
D) social and economic interests that are disregarded by the two major parties for certain reasons.

Third parties in the United States represent social and economic interests that are often ignored by the main two parties. This can include individuals who don't feel represented by the current political climate, issue-based groups, and more. It is not typically associated with extremist religious groups or recent immigrants, and while America's allies may try to influence American policies, they do not typically form third parties within the United States.