Answer: whom you met last week
Explanation:
An adjective subordinate clause is one that has the adjective value and function, that is, equivalent to it.
He wants to make sure that he punishes Fortunato for his imagined wrongs, and he has to get away with it. At length I ... Finally, Montresor kills Fortunato by bricking him into the wall.
If the letter you are referring to is the one you get when you have your credit card account or bill delivered to your home, then the best answer would be most likely the second one. The letter provides the recipient information about the condition of his own bank account.