Question

1. what textual evidence supports your answer to the previous question?

\it had been a normal day at school.\
\math, equations, yadda, yadda, yadda.\
\but that illusion shattered in a few short hours.\
\the room fell silent.\

Explanation:

Without knowing the previous question, it's impossible to accurately determine the best - fitting textual evidence. However, if the previous question pertained to a change in situation or disruption of normalcy, "But that illusion shattered in a few short hours." would be a strong candidate as it indicates a shift from a previous state.

Answer:

No answer can be given without the context of the previous question.