What Is One Way in Which the Two Major Parties

What is one way in which the two major parties restrict the ability of third-party candidates to compete?

A) Ballot access laws,put in place by the major parties,require they either must achieve certain vote thresholds or gather many signatures to appear on the ballot.
B) The filing fee is often very high,which is a deterrent to third-party candidates.
C) The secretary of state often simply refuses to accept the application of third-party candidates.
D) The major parties restrict the fundraising ability of third-party candidates.
E) The major parties can block third-party candidates from buying advertisements.