单项选择题

阅读下面程序,则程序执行后的结果为
#include 'stdio.h'
main()
{int a=4,b=6,c=7;
double d,fun(int,int,int);
d=fun(a,b,c);
printf('%lf\n',d);}
double fun(int a,int b,int c)
{double s;
s=a%b*c;
return s;}
A.27
B.27.000000
C.28
D.28.000000

A.h'
B.27
C.27.000000
D.28
E.28.000000