I'm pretty sure that it's D. In addition
A. <span>It creates a melancholy mood that reflects the narrator’s feelings.
The imagery described in this paragraph is very melancholy, which seems to support the narrator's feelings.
He uses phrases like "patches of snow and earth" and "spotty clouds" which give the image of incompleteness, something not quite full.
He also uses images of darkness, "black trees" and "the stars were out" which support the unhappiness of the narrator's mood. </span>
B - conscience. Unconscionable means 'not right or reasonable'