The man who did the most to challenge mass society theory and encourage development of scientific theories of mass communication was: a. Paul Lazarsfeld b. Walter Lippmann c. John Dewey d. Harold Lasswell

a. Paul Lazarsfeld

Explanation:

Paul Lazarsfeld -

He was the founder of the Columbia University's Bureau of Applied Social Research.

Paul Lazarsfeld was a very famous Austrian-American sociologist.

He started the use of various techniques and organization of the social research.

He contributed most to the challenge mass society theory and encourages the development of the scientific theories about the mass communication.

Hence, from the given information of the question,

The correct answer is a. Paul Lazarsfeld.