It Was Reported That a Drug for Treating Cancer Was

It was reported that a drug for treating cancer was providing positive preliminary results. If the drug is cleared by the Food and Drug Administration and the company is successful in obtaining a patent for their product

A) the patent holder will have to operate as a perfect competitor.
B) the patent holder will have to charge a price equal to marginal cost.
C) the patent holder has a monopoly.
D) the drug would have many close substitutes.