The Figure Above Shows the Demand for College Education (D)

Multiple Choice

The figure above shows the demand for college education (D) , the marginal social benefit of college education (MSB) , and the marginal cost of the private schools (MC) .
-Using the figure above,suppose education is provided by public colleges,where tuition is set at $10,000 a year.Then,________ million students are enrolled,and the taxpayers cover ________ of the marginal cost per student.

A) 15; $15,000
B) 7.5; $5,000
C) 3.5; none
D) 15; $25,000
E) 7.5; $15,000