2 answers:
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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The answer is "A" Vital.
Example- If someone got there tooth knocked out, it would be vital to put it in milk.
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I think that your answer would be D. Many buses in the terminal are waiting to depart
I believe it's <span> D) Reconstruction</span>
