In Terms of the Evolution of the Marketing Research Industry,what

In terms of the evolution of the marketing research industry,what was the significance of the era which ranged from about 1940 to 1960?

A) Questionnaires were put into use providing marketing researchers with a method of gathering new information from customers,dealers,and competitors.
B) Finally,marketing research became fully accepted;formal recognition of the marketing research function led to the creation of marketing research departments.
C) High-tech products such as CARDs,CATIs,SPSS,and DBMs developed.
D) Focus groups,statistical analysis,and the computer became part of the marketing researchers' tool kit,greatly aiding them in their research efforts.
E) none of the above