单项选择题

有以下程序
#include<stdio.h>
struct Sint 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]);

程序运行后的输出结果是______。

A.1,2,3,4,5,6,7,8,9,10,
B.10,9,8,7,6,5,4,3,2,1,
C.2,3,1,6,8,7,5,4,10,9,
D.10,9,8,7,6,1,2,3,4,5,