Answer:
Q1 - The correct inference is "The narrator has plotted his revenge in secret.". He makes it clear when he talks about the immolation he has planned for Fortunato to endure. He feels deeply <u>offended</u> by something his friend had done to him, although he never reveals on what the offense consists of.
Q2- The correct inference is "Fortunato thinks himself to be a better connoisseur of wines than Luchesi", so he mocks his <u>inability to distinguish two different types of wine</u>, also declaring that he would know how to do so. The narrator takes advantage out of his pride to lead him to his death.
Q3- The correct inference is "The narrator knows he will abandon Fortunato in the vaults", because at that moment he had already <u>chained Fortunato to the vaults</u> and is building the wall so he couldn't leave. Fortunato, being drunk, hasn't noticed that he had fallen on a trap.
Q4- The correct inference is "Fortunato likes the Montresor family motto", since <u>he shows that he appreciates it</u>. But, being drunk, he doesn't think about the meaning behind it and doesn't associate his descend to the vault to the revenge feeling his friend might have towards him.
Q5- The correct inference is "Fortunato will never leave the vaults again". The narrator mocks him saying "let us be gone", meaning himself and not Fortunato, who is now chained to the vault and trapped forever.