Harris Enterprises machines heavy-duty brake rotors that are used on commercial airliners. The company's management developed the following standard costs: Standard direct labor hours per rotor Standard overhead rate per direct labor hour 2 $13.00 Actual activity for October: Actual overhead costs incurred Actual direct labor hours Actual rotors machined $166,500 11,100 3,900 What is the total variable manufacturing overhead variance in October? A. $115,800 unfavorable B. $65,100 unfavorable C. $115,800 favorable D. $65,100 favorable