Answer:
The correct option to the sentence is:
- Tú dijiste la historia a mi hermana.
1. Se la dijiste.
Step-by-step explanation:
In Spanish is used the contract form that means the same to an ordinary sentence but this uses object pronouns, in the sentence you can see that the noun that refers is "mi hermana" that could be replaced by the personal pronoun "ella" or she in English and the object pronoun that applies for that noun is "se", after the object pronoun goes the article, no before, in this case, the article "la".