The answer is A) description because the teacher is describing the exact consequence for the exact behaviour. We can see that she has little time for nonsense and for misbehaviour and that she is strict and doles out punishments. While we can see this through actual dialogue it is not dialogue that characterizes the teacher. Pacing is used to see how fast or slow the story progresses and reflection is looking back on a story.
According to this paragraph, I would say that the tone is sad and informal. It could be considered sad because of her personal experience. How she also felt when her first boyfriend left her for another girl.
I believe it is option "D.) The flu vaccine is not reliable enough to be worthwhile" It would have a negative impact on the economy due to people not spending money to have the flu vaccine.
