You are conducting a research study on a new ADHD drug and a 13-year-old girl tells you that she wants to participate. What will you need in order for her to participate?
a. Nothing-it's her parents' decision.
b. Consent from her will suffice because she has reached the legal age of consent.
c. This research is not allowed, because it presents a conflict of interest between child and parent.
d. Assent from her and consent from her parent or legal guardian.