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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.
1. a piece of wood or other material used to stop up a hole or aperture. 2. a core or interior segment taken from a larger matrix. 3. an attachment at the end of an electrical cord that allows its insertion into an outlet or jack. 4. spark plug (def. 1).