All of the Following Are Correct About Market Research Methods

All of the following are correct about market research methods except:

A) It is important first to understand how groups of consumers are classified or segmented.
B) Markets can be segmented to increase the percentage of responses and to formulate effective marketing strategies that appeal to specific consumer groups.
C) Direct mail marketing methods are usually cost-effective.
D) Market segmentation is done with the aid of tools such as data modeling and data warehousing.