The standard and actual prices per pound of raw material are $4.00 and $4.50, respectively. A total of 10,500 pounds of raw material was purchased and then used to produce 5,000 units. The quantity standard allows two pounds of the raw material per unit produced. What is the materials price variance?

a. $5,250 favorable

b. $5,250 unfavorable

c. $5,000 unfavorable

d. $5,000 favorable