The correct answer to the question is : A) Exhaust valve.
Step-by-step explanation:
There are two types of valves in the internal combustion engine which are known as intake valve and exhaust valve.
The function of the valve in internal combustion engine is to give a free passage to air in and out. The intake valve lets the fresh air into the engine while the waste products of combustion are eliminated through exhaust valve.
Crankshaft converts the linear reciprocating motion into rotational motion which is required for automobiles.
Hence, the correct answer is exhaust valves.