The root word for educator is educate which means to teach, to train or to supervise a practice by formal instruction to develop skills, profession or trade.
The suffix -or is a word ending added to the stem of a word educate. Suffixes and prefixes are affixes or word endings that can change or add a meaning to the stem of a word being added to. For instance, the word educate. The term "educate" is a verb meaning to teach, but when added by the suffix -or, the verb becomes a noun. It becomes "educator" which now, has a new meaning, a teacher. The difference brought by adding an affix to a stem of word is very obvious.
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A or c might be the answer
An unreliable narrator can actually be any type of narrator—limited, omniscient, or limited omniscient. What unreliable means is that the narrator can’t be trusted because he or she has provided accounts that prove to be incorrect either on purpose or because of some mistakes in assessing a situation. An unreliable narrator can increase the true-to-life aspect of a work (which tends to make things more interesting) because of how humans are far from perfect and can, too, be prone to lying and being incorrect.