Krizum Industries makes heavy construction equipment. The standard for a particular crane calls for 31 direct labor-hours at $15 per direct labor-hour. During a recent period 1,850 cranes were made. The labor rate variance was zero and the labor efficiency variance was $6,300 unfavorable. How many actual direct labor-hours were worked?

A) 63,650

B) 57,350

C) 57,770

D) 55,500