单项选择题
A monopolist faces a constant marginal cost of $1 per unit. If at the price he is charging,the price elasticity of demand for the monopolist's output is -0.5, then:
A.
the price he is charging must be 2.
B.
the price he is charging must exceed 2.
C.
the price he is charging must be less than 2.
D.
the monopolist can not be maximizing profits.