Answer:
He/She may be unable to operate the system without reading the documentation. He/She may get poor grades as a result of being unable to operate the system. He/She may get shouted at for not being able to operate the system.
I think the answer maybe D coz when 2 people teaches 1 there is humorous effect
what i do is make a play list of the song she or he is going to play and then put them on repeat and listen to them while you working or doing something even when they get old kepp doing it