Why does the student say that it’s complicated and embarrassing?

M: Hi, Doctor Muff. Can I discuss my grade on my term paper with you?
W: Sure, Andrew. What is the problem?
M: It’s a bit complicated, or rather, kind of embarrassing. (1) To be honest, I made a rather stupid mistake.
W: OK, go on, Andrew.
M: (2)The term paper I handed in is not my final edited version. The paper you marked is not the paper I had intended to submit. Perhaps I was overtired and stressed, but when I saw the mark on my paper, I quickly realized what had happened. I must have printed an earlier draft at the last minute, thinking I was printing out the final paper. Doctor Muir, I must be honest with you, maintaining my average is extremely important to me, as this will affect my application to grad school.
W: Well, Andrew, that sounds like a terrible mistake. I’m not sure what can be done about it at this point. The paper was due three weeks ago, and they’ve all been marked and given back to the students. (3) Let me talk to some of my colleagues about your situation, and we’ll go from there.
M: Thank you, Doctor Muir. I really appreciate this. Should I give you the correct paper today?
W: No, Andrew. Let’s wait until I talk to some people. Check back with me on Wednesday, and I’ll let you know the outcome.