What is the output of the following code?

#include<stdio.h>
int cnt =0;
int my_function(int n, int sm)
{
      int i, tmp_sm;
      for(i=1;i<=n;i++)
      {
          tmp_sm = recursive_sum_of_digits(i);
          if(tmp_sm == sm)
            cnt++;
      }
      return cnt;
}
int recursive_sum_of_digits(int n)
{
      if(n == 0)
        return 0;
      return n % 10 + recursive_sum_of_digits(n/10);
}
int main()
{
      int n = 20, sum = 3;
      int ans = my_function(n,sum);
      printf("%d",ans);
      return 0;
}

A. 0

B. 1

C. 2

D. 3

Answer: Option C