Answer:
C) they were biased
Explanation:
Dr. George Gallup founded the American Institute of Public Opinion -- which evolved into Gallup in 1935. The Gallup Poll is the division of Gallup that regularly conducts public opinion polls in the United States. Gallup polls aim to represent the opinions of a same opinion group rather than interviewing everyone in a given country. So this method removed biasness and saved time.
