A company's production department was experiencing a high defect rate on the assembly line, which was slowing down production and causing a higher waste of valuable direct materials. The production manager decided to recruit some highly skilled production workers from another company to bring down the defect rate. This would produce a(n). OA unfavorable direct labor cost variance B. unfavorable direct labor efficiency variance OC. unfavorable direct materials efficiency variance OD. unfavorable direct materials cost variance