Answer:
D perhaps.
Explanation:
I would have picked major newspapers in the 1900s to the end of WWII, but other than Watergate broken open by the Washington Post, I don't think investigative Journalism sees its standards practiced any more.
Radio Talk shows? You mean like Fox? You're kidding right?
Tabloids are even worse than Radio Talk Shows. I once saw a cover story about aliens inhabiting the bodies of legislators. Since then, even in grocery story check out lines, I've stopped looking. What's the point?
You're stuck with D. I think these people at least try to dig for the facts. They do have an ax to grind, but I think to do some honest investigating.