Question

Which sentences contribute to the overall eerie mood of this excerpt from “The Cask of Amontillado” by Edgar Allan Poe?

Answer 1

Some sentences are "We had passed through long walls of piled skeletons, with casks and puncheons intermingling, into the inmost recesses of the catacombs." 
This sentence speaks of the dead bodies or what is left of them. Another sentence is "We are below the river's bed. The drops of moisture trickle among the bones." This sentence describes the eerie setting. We also red about the grossness of the drunk fool. This adds to the unknowingly fact that it is dark, and eerie, and something will happen. Hope this helped. 

Answer 2

I believe the answer is: he drops of moisture trickle among the bones, We had passed through long walls of piled skeletons, with casks and puncheons intermingling, into the inmost recesses of the catacombs

In literature, eerie mood refers to a situation that make the readers feel fear, strange and frightening

In order to identify the sentences with eerie mood, the fastest way is to find the sentences that contained words related to death,mystery, depression, or murderous intent.