Read this passage from "The Fall of the House of Usher" by Edgar Allan Poe:
There was an iciness, a sinking, a sickening of the heart - an unredeemed dreariness of thought which no goading of the imagination could torture into aught of the sublime. What was it - I paused to think - what was it that so unnerved me in the contemplation of the House of Usher?
Which word contributes to the Gothic tone of the passage?
A. sinking
B. heart
C. contemplation
D. imagination