单选题

序列{49, 33, 55, 80, 20, 15, 49}用堆排序使其递增，输出第一个数后，调整之后新堆的层

Question

A. 20, 55, 49, 80, 30, 49

B. 20, 30, 49, 80, 55, 49

C. 20, 49, 49, 30, 80, 55

D. 20, 30, 49, 49, 55, 80