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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It makes someone persuaded into doing something (the thing you’re writing about) it makes someone believe in what your essay is about.
Answer:
B
Explanation:
The climax is the result of the crisis. It is the high point of the story for the reader. Frequently, it is the moment of the highest interest and greatest emotion. The point at which the outcome of the conflict can be predicted.
A adjective because "The true king of the beasts is the elephant" is describing the elephant