Help please I know the answer just trying to see different ways to answer it.(Picture)

Answer:
If it's national Holiday, then school is not in session. <- Answer
If school is not in session, then students could be anywhere???
Step-by-step explanation:
1. The school observes National Holidays. It's a National Holiday so school is not in session.
2.If school is not in session the children are not at school. The children could be at home or anywhere besides school because school is not in session.
Hope this helps :)