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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.
The part you plug the cable into is called a jack. (It accepts a plug) Plugs and jacks are collectively known as connectors. I would reserve use of the word port for the whole circuit (including the jack, the integrated circuit that translates the signals, and the wires or circuit traces connecting them)