Periodic tune-ups are important because they

Here is the full choices for this question:
A. extend the life of your car
B. help you avoid costly repairs
C. prevent dangerous breakdowns
D. all of the above

I believe the answer is: D.all of the above.
Periodic tuneups refer to a scheduled maintenance that is ,made to ensure that your car is run at its peak efficiency. Conducting periodic tuneup would prevent the gears in your cars from deteriorating and make you become aware of potential problem before it becomes too damaging

Lol that is s funny : )