单项选择题
Consider inserting a target element e into a BST. when it fails to be found during the search, which node does _hot correspond to? 对BST进行插入操作，对待插入的目标元素e进行查找后，若查找失败，_hot指向的节点为：
A．The node to be inserted 待插入的节点
B．The parent of e after the insertion e被插入后的父亲
C．The left-child of e after the insertion e被插入后的左孩子
D．The root 根节点
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