单选题

下面代码段存在致命问题的是单选()

Question

A. #include <stdio.h>

register int i = 0
printf("i = %d, &i = %p\n", i, &i)

B. #include <stdio.h>

int * restrict p = 0
printf("p = %p\n", p)

C. #include <stdio.h>

volatile int j = 0
printf("j = %d, &j = %p\n", j, &j)

D. #include <stdio.h>

int main(void) {
int * k = malloc(8)
printf("k = %d, &k = %p\n", *k, k)
return 0
}