单项选择题

#include "stdio.h"void main(){int a=1,b=1;int c=0;for(a=1;a<=5;a++){for(b=1;b<6;b++){printf("*");}c++;printf("\n");}printf("%d",c);}以上程序,输出星星的个数是

A.20
B.25
C.30
D.15