[单选题]有以下程序：#include void fun(int a,int b){　int t;　t=a;　

A1,2,3,4,5,6,7,8,9,0,

B2,1,4,3,6,5,8,7,0,9,

C0,9,8,7,6,5,4,3,2,1,

D0,1,2,3,4,5,6,7,8,9,