Your reflection shows a good indication of where the confusion occurred, which is a good first step. It is easy to misinterpret subtle differences, especially under time pressure. You were right, "judging what happened" implies more of a snap, or superficial level of response, while "carefully analyze the reasons" implies greater consideration. C more accurately captured that distinction. Hopefully, next time you will consider unpacking the meaning just a bit more. I think you are absolutely correct in taking the time to review your mistakes so carefully that is the way that real progress happens.