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The correct answer among the choices given is option B. The length of the metal threads at the end of a spark plug is called the insulator. The insulator is the main part of a spark plug and is typically made from alumina. This is a very hard ceramic material with high dielectric strength.

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Answer:

d. reach

Explanation:

A spark plug is a device for igniting a definite volume of compressed air mixed with fuel. It has majorly three parts, center electrode which is an insulator, the thread reach at the end of the plug and a side metallic electrode. It is used in mechanical devices where combustion is of great importance.

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