有以下程序#include #include main(){ char a[5][10]={ "china","beijing","you","tiananmen","welcome"}; int i,j; char t[10]; for(i=0;i<4;i++) for(j=i+1;j<5;j++) if(strcmp(a[i],a[j])>0) {strcpy(t,a[i]); strcpy(a[i],a[j]); strcpy(a[j],t);} puts(a[3]);}程序运行后的输出结果是_______。

A. beijing
B. china
C. welcome
D. tiananmen