The preposition in the sentence is 'since' which is normally used in the Present Perfect
Your answer would be option C...
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The answer to the quote from The Cask of Amontillado is that Montresor buried all of the old bones. "In pace requiescat" translates to "rest in peace". The Cask of Amontillado itself is said to be the heart of a body inside of the vault that contains all of the bones.