Political Scientists Became Critical of Public Opinion Research Conducted in the 1950s

Political scientists became critical of public opinion research conducted in the 1950s because:

A) researchers in the 1950s lacked the tools to conduct a nationwide survey.
B) these early studies relied primarily on focus group research.
C) these early studies oversampled wealthy respondents because they were the most likely to own a telephone.
D) these early studies asked questions unrelated to politics.
E) researchers had an overly narrow view of what public opinion should be.