This is the best choice from among the four. Just because the serial killers shared this common trait doesn't mean that they were afraid of the number 13. That's made-up information. I was technically correct in my noting that they all had 13's in their phone numbers. I might be wrong in my conclusion, but the observation itself is accurate.
Teens have a LOT of attitudes.
And, personally, I like my students to avoid research where I have to worry continuously about their kneecaps. This topic is sufficiently narrow, and you can probably get access to the population you want to study. We actually use their work to help us do ours, but we still need to add to the literature by doing something ourselves. It's the best place to find out anything about anything. While extramural sports programs might be related to student satisfaction, it would be hard to tie the presence of such programs to cultural diversity.