The Input Demand Curve for an Output Market Monopolist Slopes

Multiple Choice

The input demand curve for an output market monopolist slopes downward because:

A) as the price of the input increases,a higher quantity of the input is employed.
B) marginal product of the input increases as more input is employed.
C) marginal revenue declines as more of the input is employed.
D) price and marginal revenue are inversely related.