Tennies Clinic uses client-visits as its measure of activity. During November, the clinic budgeted for 4,300 client-visits, but its actual level of activity was 4,290 client-visits. The clinic has provided the following data concerning the formulas used in its budgeting and its actual results for November:

Data used in budgeting:

	Fixed element per month	Variable element per client-visit
Revenue	$ 0	$ 37.40
Personnel expenses	$ 31,500	$ 12.40
Medical supplies	2,200	7.80
Occupancy expenses	9,600	3.90
Administrative expenses	7,900	0.40
Total expenses	$ 51,200	$ 24.50

Actual results for November:

Revenue	$ 160,661
Personnel expenses	$ 84,652
Medical supplies	$ 36,512
Occupancy expenses	$ 25,831
Administrative expenses	$ 9,367

The spending variance for medical supplies in November would be closest to:

A: $850 F

B: $772 U

C: $850 U

D:$772 F