As Bierce chooses to write the third section of the story through Farquhar's perspective, the story begins to reveal the use of figurative language that the previous two sections didn't include. In particular, Bierce makes use of imagery. He gives a vivid description of Farquhar's supposed escape and the sights and sounds he sees and hears. He describes nature in great detail; for example, the veins as well as the sounds of tiny insects.
The answer is C. the poetic device being used here is an idiom
A. Passing off the work of someone else as your own
One starts with S and the other starts with Y.
