Which of These Is NOT an Obstacle Commonly Faced by Third

Which of these is NOT an obstacle commonly faced by third parties who try to run their candidate for office?

A) The candidate's positions are often considerably outside the mainstream.
B) Many states require a considerable number of signatures to get on the ballot.
C) The path to the ballot is different in many states.
D) It is difficult to qualify for the federal government's partial funding of presidential campaigns.
E) All of the above are obstacles for third-party candidates trying to run for the presidency.