Answer & Explanation
Most people will jump right into understanding how the entire line might look like, checking every possible position, and who could stand in it.
However, this "brute-force" method is a complete overkill for this question. Let's take advantage of the answer options to solve this one.
Georgia appears in all answer options, so she naturally can be last. There is no need to check it.
John appears in only one answer choice (E), so that is a good indicator that he probably cannot be last, otherwise, the answer is immediately clear. And yet, let’s check it just to be sure.
According to the third rule, John is in front of Heather. If John is in front of someone, that means he cannot be last (regardless of Heather standing third). Therefore, answer E is wrong.
Ian appears in all remaining answers. No need to check for him as well.
The only question is whether Kilgore, Lumina, or both can stand last. After checking each of these cases specifically, we can deduce that there is no rule preventing either Kilgore or Lumina from being last.
Therefore, the correct answer is (D).
You can see how we have refrained from determining the exact locations of all 6 participants in every possible variation and instead checked only 3 specific individuals. Processes such as this will immensely cut down your solving time.