The correct answer is C) polls and surveys.
The following options are ways in which public opinion is measured in America: polls and surveys.
A poll is an investigation instrument used to ask you a question on any subject. It could be a multiple question. A survey, on the other hand, has a considerable range of multiple questions on a subject. People can add a comment on the survey. A poll could be as simple as “Are you a Democrat or a Republican? In a survey, you could be asked about your electoral preferences, your preferences in different elections, a public topic of concern, among many others.