Why did Chris get an “F” in physics? Why did he stop playing the French horn? At what sport did he excel?

From the text:

Only once did he receive a grade lower than B: an F, in high school physics. When he saw the report card, Walt made an appointment with the physics teacher to see what the problem was. “He was a retired air force colonel,” Walt remembers, “an old guy, traditional, pretty rigid. He’d explained at the beginning of the semester that because he had something like two hundred students, lab reports had to be written in a particular format to make grading them a manageable proposition. Chris thought it was a stupid rule and decided to ignore it. He did his lab reports, but not in the correct format, so the teacher gave him an F.After talking with the guy, I came home and told Chris he got the grade he deserved.”

Please post your questions separately and place them in the proper category.