The Juice 4 Kids Company makes individual juice boxes containing 100% fruit juice. The standard quantity of waxed cardboard for each juice box is 3 ounces, and the standard price for the cardboard is $0.0125 per ounce. In December, Juice 4 Kids purchased and used 100,000 ounces of waxed cardboard and paid $0.0128 per ounce. During the month, the company produced 32,000 juice boxes. Determine Juice 4 Kids direct materials price variance for cardboard for December.

A : $30 F

B : $300 U

C : $30 U

D : $300 F