For ordered subsequences (set their length to k) during insertion sorting.对于插入排序过程中的已排序子序列（设其长度为k）：
AThe elements are the smallest k elements in the entire sequence其中的元素是整个序列中最小的k个元素
BThe elements are the biggest k elements in the entire sequence其中的元素是整个序列中最大的k个元素
CThe elements are the k elements at the front of the original sequence.其中的元素是原序列中位于前方的k个元素
DThe elements are the k elements at the back of the original sequence.其中的元素是原序列中位于后方的k个元素