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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.
Tip or firing end. The tip configuration of the plug refers to its 'projection' - that is the amount that the central electrode and, to some extent, the ceramic insulator of the central electrode, protrudes from the threaded shell of the spark plug.