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.
Answer:
Explanation:
Bonjour,
Nous _sommes __ italiennes et vous __êtes __ américains.