Answer:
I would say it's D
Step-by-step explanation:
A isn't the correct answer because this is established in the first three lines, "Strolling along By the teeming docks, I watch the ships put out." B is incorrect because the simile compares the ship's action to the mastodons, not their appearance. C is incorrect because just like B, the simile is not talking about appearance. Although, I'm only like 95% sure that's correct