Answer: You're supposed to answer this by yourself
Explanation:
The Question is about your greatest regret not nobody else
I don't want to be rude or anything but this looks like it would be a math question
I need more info I can really help you text me
II is the answer. Can you please give me some thanks please
The word <em>whom </em>in this sentence is used as 2. object of a preposition.
Since it can be found after a preposition <em>for, </em>it is object of a preposition.