Stelmack Corporation, a manufacturing Corporation, has provided data concerning its operations for September. The beginning balance in the raw materials account was $27,000 and the ending balance was $20,000. Raw materials purchases during the month totaled $80,000. Manufacturing overhead cost incurred during the month was $72,000, of which $3,000 consisted of raw materials classified as indirect materials. The direct materials cost for September was: A. 84k B. 87k C. 70k D. 90k