During October, 10,000 Direct Labor Hours Were Worked at a Standard

During October, 10,000 direct labor hours were worked at a standard cost of $10 per hour.If the direct labor rate variance for October was $4,000 unfavorable, the actual cost per direct labor hour must be

A) $10.40.
B) $10.00.
C) $9.60.
D) $9.20.