"you are not of the masons." "yes, yes," i said; "yes, yes." "you? impossible! a mason? " "a mason," i replied. "a sign," he said, "a sign." "it is this," i answered, producing from beneath the folds of my roquelaire a trowel. "you jest," he exclaimed, recoiling a few paces. "but let us proceed to the amontillado." "be it so," i said, replacing the tool beneath the cloak and again offering him my arm.

1.montresor is not a mason
2.fortunato is not a mason
3.fortunato does not believe that montresor is a mason
4.montresor does not believe that fortunato is a mason

3. Fortunato does not believe that Montresor is a mason.

Explanation:

In Edgar Allen Poe's short story "The Cask of the Amontillado", the narrator Montresor had always looked for a chance to finally get his revenge n his friend Fortunato for always insulting him numerous times. So, taking advantage of his friend's interest in wines, he invited him over for a taste of the new and valuable wine from Amontillado.

Once in through the vaults, Montresor began talking about his family being Masons. The given passage shows how Fortunato finds it hard to believe that his friend Montresor is a Masons. The Masons are a group of secret societies in ancient history known for their fraternal society. So, it is understandable for Fortunato to believe that his friend is an actual member of the Freemasonry society.

buy a huge library full of all the books ever written

adverb is the answer i believe.