Susan, a Researcher, Is Interested in Studying the Relationship Between

Susan, a researcher, is interested in studying the relationship between illegal drug use and certain high-risk sexual behaviors in her college. She collects filled-out questionnaires from students and faculty and has each subject identified by his or her Social Security number. In this case, Susan is most likely to be in jeopardy for violating the principle of

A) informed consent.
B) debriefing after deception.
C) right to withdraw.
D) confidentiality.