Which Does Not Represent a Systematic Method of Research

Multiple Choice

Which does not represent a systematic method of research?

A) pre-testing of a survey to determine potential biases in wording
B) verifying that interviews were actually conducted with selected respondents by use of a telephone
C) use of a nonprobability sample in a legal case involving retail pricing
D) removing potential respondents, who have moved prior to a store being renovated, from a store image survey