Final answer:
The correct completion of the sentence is 'happily'. The adjective 'happy' describes the way in which the beauty and the beast have lived.
Step-by-step explanation:
The correct completion of the sentence is 'happily'.
In this sentence, the adjective 'happy' is used to describe the way in which the beauty and the beast have lived. By using the adverb 'happily', it modifies the verb 'have lived' and expresses that they have lived in a happy manner.
For example, we can say, 'The beauty and the beast have lived happily ever after'. This sentence indicates that they have enjoyed a joyful and content life together.
Learn more about Adjectives in English