Read the following context and choose the best option to answer the question.
Context: Today I went to the " Yamaka My Weekend " festival . While I was there , Casey and I ran into somebody we knew from junior high . Her name is Sarah .
Question: Why is the narrator feeling nostalgic after going to the concert ?
Options: 
A. The narrator saw an old teacher there .
B. The narrator saw an old classmate there .
C. None of the above choices .
D. The narrator saw an old teammate there .


B