MC ATC Avc Price (dolalrs per unit) 10 6 4 N 5 va 10 15 20 Quantity (units) In the above figure, at a price of $6, a perfectly competitive firm produces and it Select one: O a. some output; incurs an economic loss O b. 0; incurs an economic loss O c.0; makes an economic profit O d. 0; does not incur an economic loss or make an economic profit