I thought it was between 15 and 35 then it is wrong. But the LRAC reaches it's min between 15 and 35.

For the firm whose cost curves are shown at right, the minimum efficient scale is O A. between 15 and 35 units of production O B. about 5 units of production O C. about 25 units of production SRATC1 LRAC SRATCA O D. the level of fixed cost corresponding to SRATC2 SRATERATC3 O E. about 15 units of production Cost per Unit 10 15 20 25 30 35 40 45 50 Output per Period