The following information summarizes the standard cost for producing one metal tennis racket frame at Spaulding Industries. In addition, the variances for one month's production are given. Assume that all inventory accounts have zero balances at the beginning of the month.

	Standard Cost Per Unit				Standard Monthly Costs
Materials	$	4.00			$	8,500
Direct Labor 3 hrs. @ $2.50		7.50				15,000
Factory Overhead:
Variable		1.60				3,200
Fixed		5.10				10,200
	$	18.20			$	36,900

Variances:
Material price	337.50		unfavorable
Material quantity	500.00		unfavorable
Labor rate	550.00		favorable
Labor efficiency	2,150.00		unfavorable

What were the actual direct labor hours worked during the month?

A)6,860.

B)6,640.

C)6,000.

D)5,780.