What Was the Significance of the Supreme Court's Decision in McCutcheon

What was the significance of the Supreme Court's decision in McCutcheon v.Federal Election Commission?

A) It expanded the ability of parties to raise and spend money.
B) It limited the ability of parties to raise and spend money.
C) It placed new limits on campaign fund-raising by corporations and unions.
D) It increased the transparency of campaigns by imposing strict disclosure requirements.