What Is the Significance Behind the Fact That Politicians, Journalists

What is the significance behind the fact that politicians, journalists, and researchers spend a lot of money and time on public opinion polls?

A) No one can accurately measure what Americans think.
B) Polling matters in the governing of the country.
C) Random samples are difficult to get.
D) The Internet has made polling much easier to do.
E) We are still learning how to conduct polls.