The Textbook Excerpt About the Study Described in Tearoom Trade

The textbook excerpt about the study described in Tearoom Trade by Laud Humphreys reveals that

A) respondents who later find out that they were used for research without their knowledge can have strong negative reactions to the results.
B) the American Sociological Association realized the need for stringent new guidelines about professional conduct in the field.
C) both a and b
D) neither a nor b