Which Statement About Informed Consent Is Most Accurate

Which statement about informed consent is most accurate?

A) Informed consent needs to be sought only if risks outweigh benefits.
B) Informed consent is required if physical risks exist but not psychological risks.
C) Researchers must obtain voluntary participation of participants after informing them of possible risks and benefits.
D) A researcher is not obligated to seek informed consent if the details of the study could upset the participant and potentially affect the study outcome.