Which Behavior Below Is the Most Questionable in Terms of the APA

Which behavior below is the most questionable in terms of the APA ethical guidelines for research with human participants?

A) Not obtaining informed consent for a study with minimal chance for harm,a guarantee of maintained confidentiality,and an absence of legal liability
B) Delaying debriefing of participants until the data collection phase of a project is complete
C) Failing to indicate deception to the participant at the time of consent
D) Offering very large incentives in exchange for participation