Oriole Company has a materials price standard of $2.40 per kilogram. 3930 kilograms of materials were purchased at $2.30 a kilogram. The actual quantity of materials used was 3570 kilograms, although the standard quantity allowed for the output was 3470 kilograms. Oriole Company's materials price variance for materials purchased is

a)$393 U.

b)$393 F.

c)$357 U.

d)$293 F.