Using the graph below, if Q = 5, Total Cost = In this graph, the y-axis is AC and the x-axis is Q. A curved line runs through the graph. A horizontal dotted line y=7 meets the vertical dotted line x=10 at a point on the curved line. A horizontal dotted line y=6 meets a vertical line dotted line x=5 at a point on the curved line. Select one: a. $6 b. $70 c. $30 d. $10