Spending in Campaigns by Individuals and Groups That Is Independent

Spending in campaigns by individuals and groups that is independent of the candidate's campaign is:

A) a form of speech that can only be regulated by the state governments.
B) a form of regulated speech that is protected because of the Fourteenth Amendment's fair elections clause.
C) protected and unregulated speech because the Courts have ruled that such spending is not corruptive.
D) protected specifically because of freedom of the press.
E) is a form of slander that is not protected by the courts.