The following schedule gives the cost data for a firm. Total Product Long-Run Total Cost 10 $200 20 $300 30 $450 40 $600 50 $1,000 Diseconomies of scale start between:
A. 0 and 10 units of output.
B. 40 and 50 units of output.
C. 20 and 30 units of output.
D. 30 and 40 units of output.