Final answer:
The girls may have been surprised when Hannah told them she went to school due to limited access to education in their community.
Step-by-step explanation:
The girls may have been surprised when Hannah told them she went to school because it is possible that not all girls in their community have the opportunity to attend school. The mention of Hannah going to school implies that education might not be easily accessible for everyone. Additionally, the surprise could stem from cultural or societal norms that limit girls' access to education in some communities.