Gate 2019 C Programming closed

Question

What will be the final output :


#include <stdio.h>

int r(){
    
    static int   num=7;
    return num--;
}
int main(){
    for(r();r();r()) {
         printf("%d ",r());
    }
    return 0;
    
}

A)63
B)41
C)52
D)630