单项选择题

有以下程序:
#include <stdio.h>
main( )
int a =0,b =0,c =0,d =0;
if(a = 1) b=1;c=2;
else d=3;
pfintf( "%d,%d,%d ,%d \n" ,a,b,c,d);

A.0,1,2,0
B.0,0,0,3
C.1,1,2,0
D.编译有错