Because a teacher is considered an authoritative figure, the note should be formally written and one that shows respect to the teacher's authority. It should also clearly state the student's request and the reason for such. Among the choices, the only one that is appropriate to use is the third choice. It uses the word "Please" and states the request (excuse from class) and the reason for the absence.
Have you ever attended a meeting online for a max time of one hour and thought it was realy bkring and hard to concentrate? now multiply that by 9. That is how online students everyday feel doing online school. I think that school should be done face to face because first...(and there you put your reason 1 and 2)
