14)I then took up three planks from the flooring of the chamber, and deposited all between the scantlings. 5 I then replaced the boards so cleverly, so cunningly, that no human eye-not even his-could have detected anything wrong. There was nothing to wash out-no stain of any kind-no blood-spot whatever. I had been too wary for that. A tub had caught all-ha! ha!

(15)When I made an end of these labors, it was four o'clock-still dark as midnight. As the bell sounded the hour, there came a knocking at the street door. I went down to open it with a light heart,-for what had I now to fear? There entered three men, who introduced themselves, with perfect suavity, as officers of the police. A shriek had been heard by a neighbor during the night: suspicion of foul play had been aroused; information had been lodged at the police office, and they (the officers) had been deputed to search the premises.

In paragraphs 14-15, the narrator's tone in describing his cleanup and first encounter with the police is one of -

A anxiety

B confidence

C indifference

D melancholy