The cooling system removes and reduces the heat caused by friction between the moving engine parts and the explosion of fuel in the cylinders. The correct option is d)
The cooling system is a system that works on engines of machines and cars. It prevents friction for the parts of the engine that are moving and runs a smooth machine.
It also prevents the heating of the machines. Furthermore, it is like a liquid coolant that cools the machines and prevents overheating.
Thus, the correct option is d) cooling.
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The question is incomplete. Your most probably complete question is given below:
a) steering
b) brake
c) suspension
d) cooling