Explanation
Solution:
The task is to identify which option is an absolute requirement for a Gala to exist.
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(a) Celebration: A Gala is defined as a festive occasion or a special social celebration. Without the element of celebration, it is not a gala.
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(b) Tuxedo: While common at formal galas, a specific dress code like a tuxedo is not a requirement for the event to be called a gala.
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(c) Appetizer: Food may be served, but appetizers are not a defining or necessary component of the event's existence.
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(d) Orator: A public speaker (orator) might be present, but many galas occur without a formal speech.
Conclusion:
The correct answer is (a) Celebration.