Final answer:
The correct answer is 'cocina'.
Explanation:
The correct option to fill in the blank is cocina.
In Spanish, different forms of verbs are used depending on the subject. 'Cocina' is the correct form for 'mi hermana' (my sister).
For example, 'Mi hermana cocina muy bien' means 'My sister cooks very well'.
Learn more about Spanish verbs and conjugation
