MC ATC Avc Price (dolalrs per unit) o GD 6 4 2 0 5 10 15 20 Quantity (units) In the above figure, at a price of $8, a perfectly competitive firm produces and it Select one: O a. some output; makes zero economic profit O b. some output; makes an economic profit O c.0; makes zero economic profit d. 0; incurs an economic loss