Refer to the Following Graph

Refer to the following graph. If the demand curve is curve D for a monopoly, the marginal revenue curve is:

A) A, which intersects the x-axis at 1/4 the quantity where the demand curve intersects the x-axis.
B) B, which intersects the x-axis at 1/2 the quantity where the demand curve intersects the x-axis.
C) C, which intersects the x-axis at 3/4 the quantity where the demand curve intersects the x-axis.
D) D, which intersects the x-axis at the same quantity where the demand curve intersects the x-axis.