7. Mondo Snow Removal's cost formula for its vehicle operating cost is $1,830 per month plus $468 per snow-day. For the month of January, the company planned for activity of 24 snow-days, but the actual level of activity was 30 snow-days. The actual vehicle operating cost for the month was $15,310. The activity variance for vehicle operating cost in January would be closest to:

A. $2,248U

B. $2,248F

C. $2,808U

D. $2,808F