Belle Auto Detailing reported the following results for the past week: C Actual number of cars detailed Actual direct labor hours used Actual total direct labor cost 140 490 $6,300 Budgeted number of cars to be detailed Standard direct labor cost per hour Standard direct labor per car 260 $7.94 2.5 What is Belle's direct labor efficiency variance? O A. $1,112 favorable OB. $1,112 unfavorable O C. $1,800 unfavorable OD. $1,800 favorable