If a Local Community Has Only One Doctor, the Monopoly

If a local community has only one doctor, the monopoly power of the physician will

A) be small if entry barriers into the local market are high.
B) depend on how many other physicians there are in the national market.
C) be total since there are not any other providers of the same service in the local market.
D) be minimal if the entry barriers restricting competition from other physicians are low.