A Nutritionist and a Psychologist Plan a Study to Evaluate

A nutritionist and a psychologist plan a study to evaluate the effects of a healthy, low fat, and low sugar diet on the ability to concentrate and perform complicated tasks. The researchers plan to first recruit volunteers and evaluate their performance under their regular diet. Then the researchers will provide the volunteers with the new diet and repeat the evaluation. Which of the following statements is false?

A) This study has only benefits; no risks are associated with it and Institutional Review Board approval is not required.
B) Informed consent is not necessary, since the participants can only benefit from such a study.
C) This is a social and behavioral science project and, as such, does not require Institutional Review Board approval.
D) All of the answer options are correct.