Practice exam, need correct answer

The Montgomery Comoration has a standard costing system in which variable manofacturing overhead is asigned to production on the basis of standard N of standard machine-hours. The following data are available for September 1,500 hours Standard machine-hours allowed for September production: $22,620 Actual variable manufacturing overhead cost incurred: Variable overhead rate variance: $3,420 Unfavorable $4,620 Unfavorable Total variable overhead spending variance: 12 Actual machine-hours worked during September is: A. B. C. D. 1,500 hours 1,600 hours 1,700 hours 1,885 hours E. None of the above