Which Is the BEST Example of Malpractice by a Psychologist

Which is the BEST example of malpractice by a psychologist?

A) A psychologist misdiagnosed a client.
B) A psychologist acted in a significantly different way as compared to the way that other psychologists would have acted under the same or similar circumstances.
C) A psychologist who did not hold a doctoral degree administered and interpreted tests while employed as a school psychologist.
D) A psychologist learned about principle of psychological test use by watching selected re-runs of Dr. Phil on Hulu.