If a Veterinary Hospital Owns a Vehicle That Is Driven

If a veterinary hospital owns a vehicle that is driven for personal use, on a routine basis, by an associate veterinarian, what type of taxation is this benefit subject to?

A) Tax exempt
B) Full tax withholding, the same as any wage, salary, or bonus
C) Partial tax withholding, depending on actual mileage
D) Personal use is not an employee benefit, according to current tax law