Read the following context and choose the best option to answer the question.
Context: After we dropped off Cade at the gym , we found her new room and then her chair ( they sit at big round tables ) . We watched as all the other kids came in and found their seats . I saw lots of them getting their pictures taken ( we took ours at home ) , and a few mom 's with tears .
Question: What may be the reason for the event described ?
Options: 
- None of the above choices .
 - It was their first day of school .
 - It was their first day of college .
 - It was their first presentation .


It was their first day of school .