Mthobeli Took Part in an Experiment Where She Was Told

Mthobeli took part in an experiment where she was told she would be required to sit alone in a darkened room for 30 minutes, after which she would be asked to complete a brief questionnaire about her future goals and plans. When she finished the questionnaire she was told the experiment was over. Mthobeli never really understood the purpose of the study, and she wasn't sure why she had to wait in the darkened room before filling out the short questionnaire. In this case, it would appear that the researchers who conducted the experiment

A) did not use an adequate debriefing procedure.
B) failed to obtain informed consent.
C) violated Mthobeli's right to privacy.
D) did not provide adequate protection from harm.