Answer:
A.) It suggests that the ship is being tossed about in turbulent seas and gives the poem a threatening tone.
Step-by-step explanation:
The expression "show your teeth" means a threat, a sign of danger and insecurity. The author used this expression to convey to the reader the idea that the sea (which is being described in the poem) is threatening and dangerous. This makes the reader feel uncomfortable and distressed by the speaker's description of the poem.