Read the following context and choose the best option to answer the question.
Context: 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 .
Question: What may be the reason why the teacher was so disappointed ?
Options: 
A. They expect better from them .
B. They failed a test .
C. They expected worse from them .
D. None of the above choices .


A