单选题

一棵二叉搜索树的前序遍历序列为：30, 20, 10, 15, 25, 2...

Question

一棵二叉搜索树的前序遍历序列为：30, 20, 10, 15, 25, 23, 39, 35, 42，下列哪项对应此二叉搜索树的后序遍历序列？

A. 10, 20, 15, 23, 25, 35, 42, 39, 30

B. 15, 10, 25, 23, 20, 42, 35, 39, 30

C. 15, 20, 10, 23, 25, 42, 35, 39, 30

D. 15, 10, 23, 25, 20, 35, 42, 39, 30