Since this is a question aimed at skill sets, I'm going to opt out of the derail about sex. I choose to regard the goal as restarting the human race, the participants as volunteers, and their role being that of caretakers.
Because of that, I'll choose Group One because they have the MD that I would need to manage the growth of the fertilized embryos I'd want as part of the effort in order to maintain genetic diversity.
Medical Doctor: See above
Supermodel: Not an up and comer still relying on looks, I'd opt for one who has made it to the top and become a successful brand for just exactly those talents. Surprise, there are supermodels that are also quite bright, such as Laura Shields.
Clown: Brings the ability to entertain children and the right one for this mission would have the overlooked physical skills a performer needs (
https://www.edutopia.org/circusfit-c...ical-education) Nothing says clowns have to be stupid either (
https://www.braingainmag.com/5-clown...know-about.htm)
Walmart Cashier: I haven't been in a real Walmart in twenty years or so, so I can't address any stereotypes. Academically, they're a blank check in this scenario because lots of people end up working in jobs like that on their way to whatever they eventually become. As far as a skill set though, this is someone who can handle a bit of pressure and do day to day work that includes stuff like cleaning. Kids, lots of kids ... I'm thinking we might need that.
Drug addict: All of the people in this project are going to have flaws. It is easy to get distracted by negative images of drug addicts, but I'm a fan of Elementary and will use that as a rare public example of a positive image for the work a recovering addict goes through. OK, a TV series is a horrible example for a real life issue, but it is accessible. There are myriad people out there who have fallen into addiction and will for the rest of their lives be recovering addicts, but the ones who aren't celebrities don't get talked about. For example, consider opioid addiction among veterans. The addict then is someone with a flaw, but hopefully the rest of the team has skills (the medical doctor and the clown for example) that can help them deal with it.