Analyzing Word Choice in Juxtaposition Context

Read the following passage:

In the heart of the vibrant city, the bustling market was alive with the scent of exotic spices and the sounds of vendors shouting their wares. Yet, amidst the chaos, one could find moments of serene beauty—a child laughing as they chased after a fluttering piece of paper, or a musician strumming a gentle tune on a weathered guitar. This juxtaposition of tumult and tranquility painted a vivid portrait of urban life, illustrating how beauty can emerge even in the most frenetic of surroundings.

In the phrase "juxtaposition of tumult and tranquility," the word "tumult" is most closely associated with which of the following choices?