Under What Circumstances Could Signing a Consent Form Fail to Protect

Under what circumstances could signing a consent form fail to protect a participant?

A) If the consent form is not written in the primary language of the participant
B) If the participant is incarcerated or court-ordered to attend art therapy
C) If the consent form discloses the name of the researcher
D) If the consent form doesn't promise to share the results with the participant when the study is concluded