Answer:
<u><em>There are several ways in which public opinion in the United States is measured, but one of the most tested ways is through polling done over the phone.</em></u>
Explanation:
It's common often contracted within public opinion polls, which are surveys requested by different groups in order to prepare people's thoughts on particular matters. These polls are administered by polling organizations, which are businesses that measure public sentiment within diplomatic methods.
I am not sure if his is crrect but I tink it is C?
