A、He failed to get the teacher’s signature in time. B、He got sick the next day. C、He did not turn in the add slip the first day

W: Hello, John, how are you doing?
M: Not very well. I was dropped from a class that I needed to take this semester.
W: You were dropped from the class? What happened?
M: Well, this class was added at the last minute because there Were so many students who needed it. I went to the class the first day it opened, and I thought that I would be added to the class because I was there that day. The professor said something about turning in the add slip right away, but I needed to get a signature for another class I was adding, so I waited.
W: So you didn’t turn in the add slip right away?
M: Right. Then I got sick the next day and missed the class. The following day when I went in to class, the teacher announced that anyone who had not turned in an add slip or missed any classes had been dropped. She said that there were too many students who wanted to take the class, and she had to accept the students who had added and were attending.
W: So what did you do at that point?
M: I left the class because I was so upset. I really needed that class to fulfil my requirements, and now my plans are ruined.