What will be the output of the following C code?

#include <stdio.h>
struct point
{
    int x;
    int y;
};
struct notpoint
{
    int x;
    int y;
};
void foo(struct point);
int main()
{
    struct notpoint p1 = {1, 2};
    foo(p1);
}
void foo(struct point p)
{
    printf("%d\n", p.x);
}

A. Compile time error

B. 1

C. 0

D. Undefined

Answer: Option A