All the Following Statements Appear in a Study's Informed Consent

All the following statements appear in a study's informed consent form. Which statement violates the Code of Federal Regulations?

A) "I understand that I may feel discomfort during the study when blood is drawn."
B) "I understand that the researcher is not responsible for negligence-caused injury."
C) "I understand that I will not be compensated for participating in this study."
D) "I understand that participating in the study will not immediately benefit me."