Engines

In my Drivers Ed course.

Which mechanical part or feature listed in Module 9 do you think is most important?
I think the most important part is the engine.
Why is that particular part or feature so important?
The car can't be driven if the engine is not functioning properly.
How do you benefit from that part or feature?
If the engine is working right, I can drive the car, which is always a plus when driving.

I pity the person who has to grade my work...