It Is More Difficult for Minor Parties to Win Elections

It is more difficult for minor parties to win elections in the United States than (in many parliamentary systems because

A) parliamentary systems provide funds only for minor party candidates in order to "level the field" with major party candidates.
B) the dominant parties in the United States have established rules that make it difficult for other parties to get on the ballot.
C) the strong labor movement in the United States has contributed to divisiveness and low voter turnout.
D) minor parties in the United States do not nominate their candidates until close to the election, which reduces any effectiveness they might otherwise have had.
E) there are not enough good candidates for third parties to attract.