Competition results in the efficient product mix because A) producers

Competition results in the efficient product mix because

A) producers are setting MRT equal to minus the price ratio while consumers are setting MRS equal to minus the price ratio ensuring that MRT will equal MRS.
B) consumers are on the contract curve.
C) the slope of the production possibility frontier will equal the slope of the contract curve.
D) the distribution of the final output is Pareto efficient.

ANSWER

A