Final answer:
The keys handed out to boys at school are likely for specific responsibilities or roles. Marji's maid is upset because she perceives it as unfair treatment of girls.
Step-by-step explanation:
In the context of the given information, the keys being handed out to boys at school are most likely referring to keys of certain areas or rooms in the school building. These keys could be given to boys who have specific responsibilities or roles, such as being a class monitor or a prefect. Marji's maid may be upset because she feels that the boys are being given more privileges and opportunities compared to the girls. This may be seen as unfair and discriminatory, causing her to be upset.