I am having a complete brain blanking moment!

59. Use Table 6 to answer this question. If the market price is $80, what is the profit-maximizing output and will be the firm profit or loss? A. 4 units and a loss of $80. B. 5 units and a loss of $40. C. 6 units and a loss of $36. D. 6 units and zero profit. Figure 14 $100 90 MC 80 AC AVC ATC, AVC, MC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Quantity per period