It is necessary to maintain the valve clearances as they

[A].	reduce the resistance to sliding that occurs between the cam and the tappet
[B].	allow for lengthening of the valves owing to the heat of combustion
[C].	increase the speed at which the valves move up and down
[D].	make the crankshaft turn smoothly

Answer: Option B

Explanation:

No answer description available for this question.