Is the most widely used method of formally measuring public opinion.
a. face-to-face interviewing
b. polling
c. the census
d. democratic elections

B. Polling

Explanation:

The most widely sued method to obtain data without any time lag or any sort of problem and the privacy of the respondents are considered accordingly. The public opinion cannot take face to face thus this method is most suitable for large masses. It helps to gather data quickly is cost-effective and does not allow much biasness. Polling can be done on any subject any topic.