What Does the Doctrine of Respondeat Superior Mean

What does the doctrine of respondeat superior mean?

A) The physician is liable for the negligent actions of his or her employees.
B) "The thing speaks for itself" and negligence must have occurred.
C) If a patient is injured during surgery, it will be assumed that the physician is negligent.
D) The patient can only sue the health professional who is negligent, not the medical office.