The correct answer is: sight and sound.
Indeed, the lexical field of this stanza is full of terms as ebony bird, grave and stern decorum of the countenance, thy crest be shorn and shaven (only through sight the narrator knows all these about the bird). Finally the word, “nevermore”, has a powerful sound effect, magnified by its rhyming repetition throughout the whole poem.
The best answer to this is B option. This is an oxymoron. An oxymoron is a contradictory phrase.
