Which of the Following Actions Taken by a Campaign Would

Which of the following actions taken by a campaign would MOST likely be protected speech based on the precedent established by Citizens United v. Federal Election Commission (2010) ?

A) A billionaire running for president decides to bypass the endless hassle of fund-raising and self-funds.
B) A private charity buys airtime for a televised event two weeks before a general election featuring celebrity speakers who criticize one of the presidential candidates.
C) A corporation's stockholders vote to send their quarterly dividends to the campaign of their favorite candidate.
D) The nominating speeches at a party's national convention include many false claims.