Portsche Snow Removal's cost formula for its vehicle operating cost is $2,310 per month plus $317 per snow-day. For the month of November, the company planned for activity of 18 snow-days, but the actual level of activity was 20 snow-days.
The actual vehicle operating cost for the month was $8,730. The activity variance for vehicle operating cost in November would be closest to:
A. $714 U
B. $714 F
C. $634 F
D. $634 U