If ZipCo's marginal revenue product curves slope, downward, what can we conclude about the structure of the market in which ZipCo sells its product?
A. The firm is a price searcher because price is greater than marginal revenue
B. The firm is a price taker because price is equal to marginal revenue
C. The firm is a price searcher because the price of each resource is constant
D. The firm is a price taker because the price of each resource is constant
E. Nothing