The right answer is "The sea is compared to a boiling pot, emphasizing its churning."
Explanation: The simile in this excerpt is making a comparison between the agitated movement of boiling water in a pan and the hectic movement of the sea.
The simile is the completeness of two terms among which there is some relation of similarity, as in the metaphor. The comparison, however, is made through a connective (with, like, looked, etc.) and seeks to enhance certain quality of the middle way (how, what, how, how much, etc.). Examples: "The sea sings like a canary"; "The city, asleep, looked like an endless graveyard."
