The Nurse Is Obtaining Consent from a Subject Newly Recruited

The nurse is obtaining consent from a subject newly recruited for a clinical drug trial that will last for 6 months. All subjects will be given gift certificates for participating. One subject says, "Well, I guess if the drug doesn't work, I'll just have to put up with the symptoms for 6 months." What will the nurse tell the subject?

A) "Participation for the duration of the study is required."
B) "Participation may end at any time without penalty."
C) "Withdrawal from the study may end at any time, but the gift certificate will not be given."
D) "You can request placement in the treatment group."