Final answer:
The possessive adjective 'notre' is the correct choice in this sentence.
Step-by-step explanation:
The correct possessive adjective to fill in the blank in the sentence 'Lilise et Wes disent: Voilà maison.' is notre. The sentence translates to 'Lilise and Wes say: Here is our house.'
The possessive adjective 'notre' is used to indicate that the house belongs to both Lilise and Wes. It agrees with the gender and number of the noun 'maison' (feminine singular) and the plural subject 'Lilise et Wes'.
Other options such as 'nos', 'mon', and 'ma' would be incorrect in this context because they do not match the gender and number of the noun and subject.
Learn more about Possessive Adjectives in French