单选题

设一组初始关键字记录关键字为（19,15,12,18,21,36,45,10),则以19位基准记录的一趟快速排序结束后的结果为()

Question

A. 10,15,12,18,19,36,45,21

B. 10,15,12,18,19,45,36,21

C. 15,10,12,18,19,36,45,21

D. 10,15,12,19,18,45,36,21