Explanation:

Let’s break it down step by step:

- N lives on an even-numbered floor above the 6th. So, N could be on 8th or 10th.

- There are only two people between N and A. So, A’s position is fixed relative to N.

- Three floors between A and J; J isn’t on the 9th.

- There are more than four floors between J and B, and B lives below N. So, B sits at least five floors away from J, but under N.

- There are three people between B and H.

- The gap between N and H is the same as between J and F.

- G is on a prime floor (so, 2, 3, 5, or 7). And G is below D, above E.

- C doesn’t live on the 6th.

Now, we try to find who’s on floor 6. After arranging all logical constraints, here’s what fits:

- D is the only name from the given options who can be on floor 6.

Let’s check the options:

1. F – No, evidence locks F elsewhere given the equal gaps rule.

2. E – G lives above E, but E can’t fit on 6 with everything else.

3. D – Yes, all clues make this possible.

4. G – G has to be on a prime floor; 6 isn’t prime.

5. Cannot be determined – Nope, it’s determined.

Correct Answer:

Option 3: D