Final answer:
The appropriate verb to fill in the blank is 'quedan' which means 'to fit' in Spanish.
Step-by-step explanation:
The appropriate verb to fill in the blank in the sentence is B. quedan. The sentence translates to 'The pants fit you well!' in English. 'Quedar' is the appropriate verb to use here because it means 'to fit' in Spanish.
Learn more about verb conjugation in Spanish