What's on your mind? ( NCLEX Q)

Q: The charge nurse on a unit should be aware that which of the following patients may not legally sign an informed consent?

A. A 55-year-old patient who is crying about the surgery she will be undergoing
B. A 16-year-old married patient
C. A 45-year-old patient who has been sedated
D. An 80-year-old patient