Which of the following is an example of a tumultuous situation?

A tumultuous situation is characterized by disorder, chaos, or emotional upheaval. It typically involves significant conflict or disturbance. In this case, a loud argument exemplifies a tumultuous situation because it suggests a heated exchange or confrontation between individuals, which can create an environment filled with tension and discord.

In contrast, the other options depict calm or peaceful scenarios. A peaceful gathering implies harmony and social interaction without conflict, a quiet library is associated with tranquility and studiousness, and a sunny day refers to pleasant weather conditions. None of these alternatives suggest the disruption or conflict inherent in a tumultuous situation, making a loud argument the clear example of such a context.