Why Was the Newspaper Preservation Act of 1970 Created

Why was the Newspaper Preservation Act of 1970 created?

A) To maintain a diversity of editorial opinion in communities where only two competing, or independently owned, daily newspapers exist
B) To protect newspapers from libel charges on the part of public figures
C) To ensure newspapers did not align themselves with a particular political party
D) To prevent newspaper advertising from masquerading as editorial content