Answer :
Final answer:
The spark plugs in an internal combustion engine need to be regularly changed to assure efficient ignition. These spark plugs ignite the air-fuel mixture in the cylinders, and their performance can be affected with time and usage. Therefore, the correct option is B.
Explanation:
In the context of an internal combustion engine in a tractor, the spark plugs are what need to be changed regularly to create the required ignition. The spark plug is a crucial component of the engine that ignites the air-fuel mixture in the engine's cylinders, producing the combustion that powers the engine. Over time, spark plugs can wear out or get fouled, impacting the engine's performance. Therefore, regular maintenance to change these spark plugs helps keep the engine running smoothly and efficiently.
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