Where is the audio, I cannot give you an answer without the audio or link
Answer:
1. Penélope me muestra sus fotos a mí
2. A ustedes les explican el problema
3. ¿Quien le presta el libro de historia a José?
4. A ti te compro un suéter bonito.
5. Yo les voy a dar mis composiciones a mis profesores.
6. ¿Nos vas a traer el documento a Ramón y a mí?
Explanation:
The answer is "Yo"
this is the answer because "Laura" is saying her opinion.
Not "nosotros"(we) because she is talking about herself.
Not "tu"(you) or "ellas"(they fem.)because it doesn't match up with the verb used in the sentence "creer".