Final answer:
The correct answer to the question is rear-wheel drive, as this is a typical setup where the transfer case is disengaged and power is supplied to only one set of wheels, usually the rear.
Step-by-step explanation:
When a vehicle transfer case is disengaged and coupled to only one drive shaft, it generally means the vehicle is in two-wheel drive mode. This can either be front-wheel drive (FWD) or rear-wheel drive (RWD), depending on which wheels the power from the engine is being sent to. Most commonly, when people refer to a two-wheel drive setup without specifying, they are referring to rear-wheel drive, where the power is sent to the rear wheels of the vehicle. Therefore, the correct answer to the question would be c) Rear-wheel drive.