I need a solution for this question

The marginal benefit in the table is: Control variable Total Benefits Total Costs Net Benefits Marginal Benefit Marginal Cost Marginal Net Benefit B(Q) C(Q) N(Q) MB(Q) MC(Q) MNB(Q) 0 0 0 900 100 800 900 100 800 1,700 300 C 800 200 600 2,400 600 1,800 700 E 400 A 1,000 2,000 600 400 200 3,500 1,500 2,000 500 500 F 3,900 2, 100 1,800 D 600 -200 4,200 2,800 1,400 300 700 -400 4,400 B 800 200 800 -600 4,500 4,500 100 900 800 4,500 5,500 -1,000 0 1,000 -1,000 Select one: O a. increasing at a constant rate O b. decreasing at a constant rate. O c. decreasing at an increasing rate. O d. increasing at a decreasing rate