Studies Have Revealed What About the Relationship Between Public Opinion

Studies have revealed what about the relationship between public opinion and public policy?

A) Public opinion favors pernicious policies, and so the best policy results when public opinion is ignored.
B) Over the last fifty years, the influence of public opinion on public policy has sharply declined.
C) Changes in public opinion usually result in corresponding changes in public policy.
D) Contrary to democratic rhetoric, the reality is that throughout U.S. history, minority interests have usually run roughshod over public opinion.
E) There is little discernible relationship between public policy and public opinion.