What will be the output of the following C code?

#include <stdio.h>
int main()
{
    void *p;
    int a[4] = {1, 2, 3, 8};
    p = &a[3];
    int *ptr = &a[2];
    int n = p - ptr;
    printf("%d\n", n);
}

A. 1

B. Compile time error

C. Segmentation fault

D. 4

Answer: Option B