精子和女性体细胞内的性染色体分别是    [ ]

A．X、XY    

B．Y、XY    

C．Y、XX    

D．Y或X、XX

Are based on the following Pascal code.FOR i:=1 TO n -1 do BEGIN k:=i: FOR j:=i+1 TO n DO IF A[j] THEN k:=j: IF k<>i THEN BEGINX:=A[k]; A[k]:=A[i]; A[i]:=x END END;<---> The sorting method described by the code is called

A． Insertion sort

B． Selection sort

C． Radix sort

D． Merge sort