Read the sentence. The office’s boisterous celebration, full of cheering, shouting, and laughter, caused other businesses on the same floor to shut their doors. The word "boisterous” most likely means

The celebration included cheering, shouting, and laughter, and it was loud enough to disrupt nearby businesses. In this context, “boisterous” means noisy and energetic, or rowdy. “Rowdy” is the best match.

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