Diagram 1 P Cost and revenues (dollars) P P; P Q. Q, Q, Quantity supplied In diagram 1 above, the curve represented by "1" is the O a marginal revenue O b. marginal cost c. average total cost O d. average fixed cost Diagram 1 P Cost and revenues (dollars) P P; P Q. Q, Q, Quantity supplied In diagram 1 above, the curve represented by "1" is the O a marginal revenue O b. marginal cost c. average total cost O d. average fixed cost