Final answer:
The word that best fits the definition is 'bailen'. It means 'to dance' and matches the subject 'los novios' (the bride and groom).
Step-by-step explanation:
The word that best fits the definition is bailen.
In this context, 'Los invitados quieren que los novios bailen' means 'The guests want the bride and groom to dance'. The verb 'bailen' is the third person plural form of the verb 'bailar', which means 'to dance' in Spanish. It is used here to refer to multiple people dancing, which matches the subject 'los novios' (the bride and groom).
Other options such as 'bailan' (they dance) and 'baila' (he/she dances) do not fit the context as they refer to different grammatical forms or subjects.
Learn more about Spanish verbs