有以下程序struct S{int n；int a[20]；}；void f(int * a,int n){int i;for(i=0；i<n-1；i++)a[i]+=i；} main(){int i；struct S S={10,{2,3,1,6 , 8,7,5,4, 10,9}}；f(s.a,s.n)；for(i=0；i<s.n；i++)printf( ％d, ,s.a[i])；}程序运行后的输出结果是【 】。
A．2,4,3,9,12,12,11,11,18,9,
B．3,4,2,7,9,8,6,5,11,10,
C．2,3,1,6,8,7,5,4,10,9,
D．1,2,3,6,8,7,5,4,10,9,