Boisterous is a rather formal term to express what rowdy also means, being the two of them synonyms, and their meanings are related to a person or a thing that is exhibiting a kind of behavior that is noisy, happy, merry, even to a disorderly point, and marked by very high spirits, usually in the context of a celebration. Boisterous would be opposed to an orderly behavior.
The answer is rowdy. Rowdy means noisy or disorderly, which is what the term boisterous is most likely to mean in this sentence. Shouting, cheering, and laughter could all go under the category of rowdy.
