I was on after - school detention on Friday night , for missing assembly earlier in the week . The teacher supervising detention was my favourite teacher . She was really upset to see me in detention , saying that I had let her down .
According to the above context, choose the best option to answer the following question.
Question: What may be the reason why the teacher was so disappointed ?
Options:
A. They are n't used to them misbehaving .
B. They expected worse from them .
C. They failed a test .
D. None of the above choices .


A