Choice D is the correct answer
I believe the correct answer would be a.
In the poem, Byron writes that daylight is "gaudy."
He does this to prove that daylight is overly bright and showy. His love is not like daylight -- she is not bright and showy.
That's why she walks like the night -- she does not need to flaunt her beauty. Her beauty is natural.
The correct answer of the given question above would be option C. METAPHOR. The given sentence above from "Self-Reliance", the type of figurative language used is metaphor. A metaphor is a figurative language that compares two different things. In this sentence, society and joint-stock company are being compared. Hope this answer helps.