The answer is C. Au revoir! À bientôt! This is because the sentence "à bientôt "means "see you soon." This is more suited to the occasion than "à plus tard", which means "see you later", and "à demain", which means "see you tomorrow", as well as just plain "au revoir", which means goodbye.
Adiossoida.......................
Elles se sont lavées les mains.
B. lavées
Vous préférez manger au restaurant ou a la maison
here its present tense but ask me if you have more questions
