Dr Harris Is a Well-Known Psychologist

Dr. Harris is a well-known psychologist. In which of the following situations does he act as a guardian ad litem?

A) Dr. Harris obtains informed consent from the parents of one clients, to write a research paper based on the client's treatment.
B) Dr. Harris provides therapy to clients from an orphanage at subsidized rates.
C) Dr. Harris begins commitment proceedings for client with schizophrenia, who is likely to harm his family if he is not provided with adequate treatment.
D) Dr. Harris has been asked to represent a child, whose parents have been accused of abuse and neglect, in a civil legal proceeding.