Assume That the Supply Curve Is Horizontal Because Marginal Cost

Multiple Choice

Assume that the supply curve is horizontal because marginal cost is constant at $10.John,Robert,and Jimmy each value one compact disc at $20 but only Jimmy and John value a second compact disc (Jimmy at $5 and John at $15) .It follows that the optimal number of compact discs sold in this market is

A) two.
B) three.
C) four.
D) five.