Lee Company's standards for the most recent period are given below. Fixed and variable manufacturing overhead costs are applied to products on the basis of machine hours. The denominator volume of machine hours is 9,000. Standard Quantity or Hours per unit Standard Price or Rate per unit Standard Cost per unit Direct Materials 3 feet $6 per foot $18 Direct Labor 1.5 direct labor hours $10 per direct labor hour $15 Variable Overhead 2 machine hours $12 per machine hour $24 Fixed Overhead 2 machine hours $15 per machine hour $30 Actual costs for the most recent period, during which 5,000 units of output were actually produced and used 9,600 machine hours, are given below: Direct Materials The firm purchased 16,000 feet at $6.30 per foot, but only used 14,500 feet in production. Direct Labor The firm used 7,150 direct labor hours and paid $11 per direct labor hour. Variable Overhead Actual variable overhead costs were $122,880. Fixed Overhead Actual fixed overhead costs were $142,000. What was the companys labor efficiency variance? A. $3,850 unfavorable B. $3,500 favorable C. $3,500 unfavorable D. $3,850 favorable