The simile "teeth white as milk" found in the second stanza of the poem most likely refers to C. the foam on the waves.
The man in the moon makes no sense, since the poem is talking about the sea. A great white shark would be a silly answer. The darkness of the sea is also incorrect because that can't be white if it's dark. So, the foam on the waves, which is white, by the way, is the correct answer.
I uploaded the answer to a file hosting. Here's link:
tinyurl.com/wpazsebu
Denotation <span>refers to the dictionary meaning whereas </span><span>connotation refers to the association or emotional meaning</span>.
Figurative is incorrect - it uses words or expressions which differ from their literal meaning.
Emotional is not a term that is used and therefore doesn't make sense.