There are ten stories in this book, ______are the most interesting ones.

【正确答案】 D

【答案解析】分析句子结构可知，逗号之后为非限制性定语从句，选项A、B、C均不能引导非限制性定语从句。结合选项可知，空处应用the first four of which，相当于the first four of the ten stories。故选D。