Which of the Following Is Probably the Greatest Weakness of American

Which of the following is probably the greatest weakness of American political parties?

A) Parties are unable to control the selection of the candidates who run for office under the party banner and to direct their activities.
B) Parties are vulnerable to being taken over by minor parties.
C) The national parties can't tell the state and local party organizations what to do.
D) The national conventions set the rules by which the national party is governed for the next four years.
E) The inability to unite local, state, and national campaigns.