【单选题】【消耗次数：1】
一棵有n个结点的二叉树，按层次从上到下，同一层从左到右顺序存储在一维数组A[1..n]中，则二叉树中第i个结点（i从1开始用上述方法编号）的右孩子在数组A中的位置是（）。
①
A[2i](2i=n)
②
A[2i+1](2i+1=n)
③
A[i-2]
④
条件不充分，无法确定
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