Physicians' Fees Have Risen Rapidly in the Face of an Expanding

Physicians' fees have risen rapidly in the face of an expanding supply of physicians. Which of the following reasons best explains this phenomenon?

A) Restrictions on advertising enable established physicians to keep new, entering physicians from competing for their customers by charging lower prices.
B) Fees charged by physicians are fixed by the government.
C) Restrictions on advertising have led to the proliferation of local monopolies within the medical profession.
D) Restrictions on physicians' freedom to relocate within certain geographic boundaries have led to price fixing within the medical profession.
E) The demand for physicians' services has steadily declined over the past three decades.