情态动词can表能力 — 英语选择题

Lily想加入学校音乐社团，面试时老师说："We need a student who can sing, but who cannot play the piano." 根据老师的话，下列哪位学生最合适？A. Amy can't sing, but she can play the piano. B. Ben can sing and he can't play the piano. C. Cindy can sing and play the piano. D. David can't sing or play the piano.