The end of the story suggests that Montresor

a. regrets killing his friend. c. has lost track of time.
b. has avoided punishment. d. has been caught by the police.

b. has avoided punishment.

The end of the story suggests that Montresor has avoided punishment (option b).

To determine the answer to this question, we need to analyze the information provided in the story. In this case, the story referred to is titled "The Cask of Amontillado" by Edgar Allan Poe.

The question asks about what the end of the story suggests about Montresor, the main character. In order to find the answer, we need to look at the events that unfold in the story's ending.

In the story, Montresor seeks revenge on his friend Fortunato, deciding to lure him into his family catacombs with the promise of tasting a rare wine called Amontillado. Once they are deep in the catacombs, Montresor chains Fortunato to a wall and proceeds to build a wall, trapping Fortunato inside, effectively burying him alive.

At the conclusion of the story, Montresor expresses that he has successfully carried out his revenge and highlights his satisfaction, even mentioning the famous Latin phrase "In pace requiescat" which means "may he rest in peace." Therefore, we can infer that the answer to the question is:

b. has avoided punishment.

It is important to note that Montresor does not directly express regret or mention being caught by the police. The story's conclusion suggests that Montresor has successfully committed his act of vengeance without facing any consequences afterwards.