有以下程序：#include＜stdio.h＞struct S{int n;int a[20];};void f(struct S*p){int i,j,t;for(i=0;i＜p-＞n-1;i++)for(j=i+1;j＜p-＞n;j++)if(p-＞a[i]＞p-＞a[j]){t=p-＞a[i];p-＞a[i]=p-＞a[j];p-＞a[j]=t;}}main(){int i;struct S s={10,{2,3,1,6,8,7,5,4,10,9}};f(&s);for(i=0;i＜s.n;i++)printf( %d, ,s.a[i]);}程序的运行结果是______。
A．2,3,1,6,8,7,5,4,10,9,
B．10,9,8,7,6,5,4,3,2,1,
C．1,2,3,4,5,6,7,8,9,10,
D．10,9,8,7,6,1,2,3,4,5,