Answer:
Mi hermana
Explanation:
Since the word is duerme, it is talking about someone specific, and mi hermana duerme sounds better then the others.
1. Are “el” and “la” , as in “el” libro and “la” carpeta.
2. Most nouns ending with “o” are masculine and most nouns ending with “a” are feminine.
The answer is A).y
good luck :)