C Programming Quizzes C Language Pointer

Question:
#include<stdio.h>
void main()
{
      int *ptr, a=10;
      ptr = &a;
      *ptr += 1;
      printf("%d, %d", *ptr, a);
}

Option A):
10, 10
Option B):
10, 11
Option C):
11, 11
Option D):
11, 10

Correct Answer is Option C):
11, 11