The Monopolist Has No Supply Curve Because

The monopolist has no supply curve because:

A) the quantity supplied at any particular price depends on the monopolist's demand curve.
B) the monopolist's marginal cost curve changes considerably over time.
C) the relationship between price and quantity depends on both marginal cost and average cost.
D) there is a single seller in the market.
E) although there is only a single seller at the current price, it is impossible to know how many sellers would be in the market at higher prices.