You are an efficiency expert hired by a manufacturing firm that uses K and L as inputs. The firm produces and sells a given output. If w = $40, r = $100, MPL = 4, and MPK = 40 the firm:
A. is cost minimizing.
B. should use less L and more K to cost minimize.
C. should use more L and less K to cost minimize.
D. is profit maximizing but not cost minimizing