0ompany's production depertment was experiencing a high defect rete gn the assembly ine, which was siowing down production and causing a higher wate of veuebe drect materisls. The production maneger decided to purchase a higher grade of materials that would be more reliable. This would produce an) OA favorable direct labor efficiency variancee OB. unfavorable direct materials efficiency variance OC unfavorable direct materials cost variance D. favorable direct labor cost variance