What's wrong with this code which returns xor of two nodes address?

//struct is common userdefined datatype in c/c++ and class is it's alternative
 
struct node* XOR (struct node *a, struct node *b) 
{
    //this logic is used to fill the nodes with address of a xor linked list
    return  ((int) (a) ^ (int) (b));   
}

A. nothing wrong. everything is fine

B. type casting at return is missing

C. parameters are wrong

D. total logic is wrong

Answer: Option B