The adjective "estudiosa" is feminine and singular. Therefore, we need to select nouns that are also feminine and singular to agree with it.
Here are the nouns you provided:
- los hombres (masculine plural)
- la estudiante (feminine singular)
- el profesor (masculine singular)
- mis hermanas (feminine plural)
- los gatos (masculine plural)
- mi tío (masculine singular)
The only noun that agrees grammatically with "estudiosa" is:
- la estudiante
So, the correct answer is la estudiante.