单选题：Which one of the following is a possible postorder traversal seq

Which one of the following is a possible postorder traversal sequence of a binary search tree? @[C](3)

A. `2 4 1 5 3 7 9 10 8 6`
B. `2 4 1 5 3 7 10 9 8 6`
C. `2 1 4 5 3 7 10 9 8 6`
D. `2 1 4 5 3 10 7 9 8 6`




A.`2 4 1 5 3 7 9 10 8 6`
B.`2 4 1 5 3 7 10 9 8 6`
C.`2 1 4 5 3 7 10 9 8 6`
D.`2 1 4 5 3 10 7 9 8 6`


答案：C