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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Answer:
The correct answer is Events!!!!
Explanation:
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About 15,000 people is the answer
What was this question or was this a troll? You can’t troll on Brainly.com as answering gives us points :p or was this part of a book? If this was part of a book for a quiz you need to provide more information