In Deciding the Precedent-Setting Corporate Political Speech Case First National

In deciding the precedent-setting corporate political speech case First National Bank of Boston v. Bellotti, the Supreme Court ruled which one of the following?

A) That corporations are too powerful to be allowed to participate in politics
B) That the voice of corporations has been overwhelming in politics
C) That "political speech" is protected, regardless of who is speaking
D) That the First Amendment applies only to individuals, not to corporations
E) That corporations undermine citizens' confidence in government