Question 9 (1 point) Refer to the graph of unit cost curves 2. If the market price is 70, then a profit- maximizing competitive firm with these short-run unit cost curves Cost 100 - 90 - 70 60 50 40 30 20 10 2 7 9 10 11 Unit Cost Curves 2 Quantity O a) will earn an economic profit equal to $280. O b) will earn an economic profit equal to $40. O c) will earn an economic profit equal to $210. O d) will earn an economic profit equal to $30