单项选择题

用冒泡法对序列(36,69,46,28,30,74)排序,经两趟冒泡的结果序列为()

A.36,28,30,46,69,74
B.36,46,28,20,69,74
C.38,36,30,46,69,74
D.28,36,30,46,69,74