Final answer:
Deception in research should be weighed against the benefits of the study and should not be used in every research study. Researchers should disclose their use of deception and provide a debriefing after the study.
Step-by-step explanation:
Deception in research is a controversial topic, and the use of deception must be outweighed by other benefits of the study (option D). While deception should not be used in every research study (option B), it can be used in certain cases where it is necessary to prevent participants' knowledge from influencing the results. However, it is important for researchers to disclose their use of deception to participants and provide a full debriefing after the study (option C).