What will be the output of the following C code?

#include <stdio.h>
int x = 5;
void main()
{
    int x = 3;
    m();
    printf("%d", x);
}
void m()
{
    x = 8;
    n();
}
void n()
{
    printf("%d", x);
}

A. Decision making B. Variable declaration C. Code organization and reusability D. Printing output

A. To declare a function's return type B. To declare a function's name C. To declare a function's parameters and return type D. To declare a function's name and parameters

A. 4 B. 8 C. 2 D. Error

A. By value B. By reference C. By pointer D. By address