51 pts A graph showing three U-shaped cost curves: MC, AVC, and ATC. MC is at the minimum of $2, AVC is at the minimum of $5, and ATC is at the minimum of $7. Alternate Text: A graph showing three U-shaped cost curves: MC, AVC, and ATC. MC is at the minimum of $2, AVC is at the minimum of $5, and ATC is at the minimum of $7. Based on the graph, what is the minimum price at which a purely competitive firm starts production? Group of answer choices $7 $2 $7 $5