If you had to decide... and support your answer, I'd say Female #1. I'm sure if this scenario happened to any of us in real life- she'd probably be the last one picked haha.

If we have to base our answers on logic, it makes sense- she has the least to offer to the world or the other survivors. Think in terms of education, experience, resources, etc. She also causes comparatively less trauma to others in disappearing (no kids/dependants/etc) - Assuming all of that was disclosed.

But Male 1 should make Male 2 and Male 3 fight over a single pill and leave with the girls and have his rich parents grab them with the family helicopter.