Answer:
A) To inform
Explanation:
The author's purpose in writing this passage is "to inform".
(Please note that there is no "to describe" in the attachment you gave).
From the excerpt, we can clearly see that the author was actually informing. The author was giving us information with facts about his master, his plantation and the author's experience in his master's plantation.
Why he does?
<span>draws attention to the line, perhaps making it seem more important.</span>
The answer is...
<span>Fortunato thinks Montresor has played a joke on him.
</span>
He literally is so drunk, that he doesn't understand that his "friend" was building a wall to cover up the room where he had chained him inside the catacombs. IF he were to be hoping that this is all a joke (second choice) He would be able to understand the situation, wouldn't be laughing... and try as hard as he could to get out. In this case he is just laughing at the "joke" his "friend" has played on him.
Good Luck! :)