Prior to leaving a parked vehicle, the driver should:

Answer: B — Set the parking brake and remove the key, stop the engine and place the transmission in gear, if parked on a hill or incline, turn the front wheels appropriately

Prior to leaving a parked vehicle, the driver should set the parking brake, remove the key, stop the engine and place the transmission in gear, if parked on a hill or incline, and turn the front wheels appropriately. This is important to ensure that the vehicle is secure and will not roll away. Option A is incorrect because locking the vehicle alone does not prevent it from rolling away. Option C is incorrect because leaving the vehicle in neutral can result in it rolling away if it's on a hill or incline. Option D is incorrect because while it's important to make sure the windows are closed for safety and security reasons, it does not pertain to preventing the vehicle from rolling away.