D 8.3-20a Outdoor Gear Corporation manufactured 2,000 coolers during October. The following variable overhead data relates to October: Variable overhead spending variance Variable overhead efficiency variance Budgeted machine hours allowed for actual output Actual cost per machine hour Budgeted cost per machine hour $1,875 Unfavorable $270 Unfavorable 615 machine hours $30 $27 Calculate the actual machine hours used by Stark during October. O A. 615 hours OB. 605 hours O C. 625 hours O D. 624 hours