#3 is wayyy too busy. They are carrying three summer (so accelerated) graduate level classes *and* working a full time job? It'll be too much on their plate.

#1 had a huge red flag with the either outright lying or deceitful behavior in a freakin' legislative hearing. If this was a more long-term job it might be different, but for a 5 week class it wouldn't be worth it with the extra watchfulness and/or potential coaching you would have to do.

#2 has a good background, enough time to focus on the job, and apparent transferable skills. I would go with them.