Answer:
The answer is B. 2.
Explanation:
We know that for N = 1 and N = 2, none of them are divisible by 3.
For N = 3, 33.33% are divisible by 3. For N = 4, 25% (which is already less than 30%), so N = 5 would also be less.
At N = 6, we're back up to 33.33%. N = 7 is already less than 30%.
At N = 9, you guessed it, 33.33%. N = 10 is 30% (3, 6, and 9). So we have one case.
Moving along, at N = 18, 33.33%. N = 20 is again 30% (3, 6, 9, 12, 15, and 18). Two cases now.
Finally, at N = 21, again 33.33%. N = 22 and N = 23 are both greater than 30%. As we continue this, for any N after 20, we will always be greater than 30%.