The best answer for the underlined word would be A: Vital
crucial means important or urgent.
required could be it but it does not imply a great amount of necessity.
The rest of the options don't even relate to this question.
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Gatsby a shot and Nick goes to therapy. Nick's therapist thanks it would be a good idea as part of his therapy to write down the story of Jay gatz so the story is like his therapy and it is told through his point of view like as if he was describing it to the therapist
C. it tells a moral tale that is at odds with the pardoner's own persona.
The answer to this is conclusion I believe