Final answer:
The appropriate verb to fill in the blank would be 'prefirieron' (option A).
Step-by-step explanation:
In the sentence, 'Mis padres no ver la pelicula anoche!', the appropriate verb to fill in the blank would be 'prefirieron' (option A). The correct sentence would be 'Mis padres no prefirieron ver la pelicula anoche!'. 'Prefirieron' is the past tense conjugation of the verb 'preferir', which means 'to prefer'.
Learn more about Verb conjugation in Spanish