Final answer:
The correct phrase to complete the conversation is 'No creo que él pueda cantar bien' which means 'I don't think he can sing well' in English.
Step-by-step explanation:
The conversation is in Spanish and the question asks for the phrase that best completes it. Person B responds by saying, 'No creo que él pueda cantar bien' which means 'I don't think he can sing well'. So the correct answer is A. pueda cantar bien.
Learn more about Completing a conversation in Spanish