Final answer:
Secondary vehicle controls are those that assist in safely operating a vehicle, providing comfort and efficiency but not primary vehicular control or emergency shutdown capabilities.
Step-by-step explanation:
The question regards the function of secondary vehicle controls. The correct answer is C: assist you in safely operating your vehicle. Secondary vehicle controls are features in a car that do not control the vehicle’s speed or direction but provide support for a comfortable and efficient driving experience. These may include air conditioning, audio systems, cruise control, and other convenience features. They do not provide backup functionality to the primary controls (which are the steering, accelerator, brakes, and gear shift) or shut down the vehicle's engine in an emergency, those would be specialized safety features not generally categorized as secondary controls.