What is the time complexity of the following code used to convert a decimal number to its binary equivalent?

#include<stdio.h>
void dec_to_bin(int n)
{
      int arr[31],len = 0,i;
      if(n == 0)
      {
          arr[0] = 0;
          len = 1;
      }
      while(n != 0)
      {
          arr[len++] = n % 2;
          n /= 2;
      }
      for(i=len-1; i>=0; i--)
        printf("%d",arr[i]);
}
int main()
{
     int n = 0;
     dec_to_bin(n);
     return 0;
}

A. O(1)

B. O(n)

C. O(n²)

D. O(logn)

Answer: Option D