A? person's income is ?$300?, the price of a video is ?$55?, and the price of deluxe pizza is ?$15. At?equilibrium,
A. the marginal rate of substitution is equal to the slope of the price consumption curve.
B. the consumer is buying three times more videos than pizzas.
C. the consumer is buying three times more pizzas than videos.
D. the marginal rate of substitution is equal to −3.0.