The Increased Importance That Politicians Have Placed on Public Opinion

The increased importance that politicians have placed on public opinion polls over the last 50 years is due in part to the fact that

A) public opinion polling is provided to political leaders free of charge.
B) the Supreme Court has struck down a number of state and federal laws that made public opinion polling illegal.
C) it has become very difficult for political leaders to experience public opinion directly.
D) media organizations no longer cover political issues as much as they once did.