The relevant production range for Challenger Trailers, Inc. is between 120,000 units and 190,000 units per month. If the company produces beyond 190,000 units per month, O A. the fixed costs and the variable cost per unit will not change O B. the fixed costs may change, but the variable cost per unit will remain the same C. the fixed costs will remain the same, but the variable cost per unit may change D. both the fixed costs and the variable cost per unit may change