The following information describes a company's usage of direct labor in a recent period:

Actual direct labor hours used 34,000
Actual rate per hour $17.00
Standart rate per hour $16.75
Standard hours for units produced 33,500

How much is the direct labor efficiency variance?

a. $8,500 unfavorable
b. $8,375 favorable
c. $8,375 unfavorable
d. $8,500 favorable