Proper function of this system helps ensure visibility (defogger/defroster) and passenger comfort a) Windshield wiper system b) HVAC system c) Lighting system d) None of the above

The correct answer is b) HVAC system.<br /><br />The HVAC (Heating, Ventilation, and Air Conditioning) system in a vehicle is responsible for maintaining the temperature and air quality inside the cabin. It helps ensure visibility by defogging or defrosting the windshield and windows, and it also contributes to passenger comfort by regulating the temperature and air circulation.