7. Josh Corp. has the following sales and operating expense data for July and August: (Hint: Use the high-low method to help you answer these questions) July 10,000 August 15,000 Units sold Operating costs: Cost A Cost B Cost C $45,000 47,000 40,000 $45,000 67,000 60,000 Which of the above graphs best depicts cost C? a. 1_ b. 2 c. 3__ d. 4