—Have you decided which you like better-the round table or the square table ?

—Have you decided which you like better-the round table or the square table ?
—Of the two , the round one is ________.
A. the nicest B. the nicer
C. nicer D. a nice one
选出答案并请说明原因，谢谢！
但是正确答案是B，为什么要加the呢？

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