The Following Questions Refer to the Graph Below

The Following Questions Refer to the graph below.
-The negative slope of the demand curve shows that

A) The marginal cost of education increases as more is purchased
B) The marginal benefit of education increases as more is purchased
C) The marginal benefit of each additional year of education decreases
D) There are positive spillover benefits of education
E) Tuition can be raised above T₁ dollars