单选题

请问以下序列中能构成最小堆的是

Question

A. 4, 5, 7, 7, 8, 10, 4

B. 10, 9, 8, 7, 3, 2, 1

C. 3, 4, 5, 5, 5, 9, 6

D. 3, 14, 10, 20, 30, 9, 12