At a Perfectly Competitive Equilibrium with Production and Trade,the Slope

Multiple Choice

At a perfectly competitive equilibrium with production and trade,the slope of the production possibility curve will be

A) equal to the slope of the price line faced by the consumers.
B) steeper than the slope of the price line faced by consumers.
C) flatter than the slope of the price line faced by consumers.
D) either steeper or flatter than the price line faced by the consumers, depending upon the relative preferences of the consumers.