18. If the rm whose cost structure is given in question 17 can sell any (integer) amount at a price of $20, what is the quantity that maximizes its prot? What is the corresponding prot level? A. Quantity of 0 because xed costs cannot be covered at a price of $20 B. Quantity of 1 for a prot of $40 C. Quantity of 2 for a prot of $12 D. Quantity of 3 for a prot of $28 E. Quantity of 4 for a prot of $20