You are driving a towing vehicle equipped with a compressed air-braking system. The brake line to the front-right wheel severs. What impact does this have when towing a trailer?

Your selections are correct. When the brake line to the front-right wheel of a towing vehicle with a compressed air-braking system breaks, the brake power of the towing vehicle is reduced because one wheel does not brake properly. However, the service brake of the trailer remains fully functional, since the compressed air system for the trailer is separate and unaffected by the brake line break on the towing vehicle. The trailer would not be braked automatically in this situation; automatic braking for the trailer only occurs if the air supply line to the trailer is interrupted or disconnected. This means the primary impact is reduced braking on the towing vehicle itself, while the trailer's braking system continues to work as intended. Remember: for questions involving air-braked vehicles, always consider whether the defect directly affects the trailer’s supply or only the towing vehicle.