Answer:
Sofía es la nieta de Isabel.
Explanation:
The reading says that Teresa is Isabel's daughter. Then, it says that Paco is the son of Teresa. But they are not asking for "nieto", the masculine of "grandson". They asked for "nieta", feminine. Therefore, we can read that Sofía is Paco's sister, who we already said is Teresa's son, which makes Sofía her daughter too. If Teresa is Isabel's daughter, her daughter is her mother's granddaughter. In conclusion, Isabel's granddaughter is Sofía.
Hope it helps!
