A company developed the following per unit materials standards for its product: 3 pounds of direct materials at $5 per pound. If 12000 units of product were produced last month and 37500 pounds of direct materials were used, the direct materials quantity variance was_________

A. $4500 unfavorable.
B. $7500 favorable.
C. $4500 favorable.
D. $7500 unfavorable.