Btw who would “mock” that it was a possibility?
It’s part of the common grading scale throughout Michigan.
I was a student in the Detroit system, with an A-E grading scale. The first time I heard someone say their grading scale was A B C D F, I thought that was nonsensical, as if they didn’t know the alphabet! I realize F could stand for fail, but the other letters grades are not alliterative, so why should the “F” be?