What does the word "boisterous" imply?

The word "boisterous" implies a sense of loudness and exuberance that often comes with high energy, merriment, or rowdiness. It describes an atmosphere or behavior that is lively, noisy, and, at times, tumultuous. Therefore, the choice that states "violently agitated and turbulent" captures the intense, sometimes disorderly nature that can accompany boisterous behavior.

While the word can convey an energetic and carefree spirit, it does not have a serene or calm connotation, nor does it suggest a reserved nature. Instead, it indicates a lack of restraint or control in a positive or negative way depending on the context, thus aligning well with the provided choice.