Final answer:
To maintain good operating condition of vehicle systems, paying attention to various senses can indicate potential issues, and reporting any defects or deficiencies to the company is essential. Waiting until a problem arises is not recommended.
Step-by-step explanation:
To keep vehicle systems in good operating condition, one should: A. pay attention to your senses; sights, sounds, smells, and/or the feel of the vehicle can indicate a potential problem. B. report vehicle defects and deficiencies that you cannot fix to your company. It is not advised to wait until there is a problem with your vehicle to schedule maintenance, as regular check-ups can prevent issues from arising. Therefore, the correct answer is D. A & B.