Help me decide from whom to ask reference letters, masters of finance

Just wanted to see the forums take in case I missed anything.

So, I have 5 options for references, and I need 3 for most masters programs. For reference, my background is highly untraditional (biochemistry) which is what makes this difficult as I would prefer a business/finance reference letter for the masters of finance programs but most of my options are from biochem

1. Senior thesis Prof supervisor - conducted year long biomedical research under him, including a full time summer internship (won a prestigious national science grant for this
2. Junior year research Prof - conducted another year long biomedical research under her, and we were fairly close.
3. Current supervisor at work - high yield credit research director, conducting high yield credit research under him.
4. Co-op training program PM - As part of the same internship as above, the coops have a mandatory training program/project headed by an equity PM. He knows me very well and I did some good modeling work for him
5. Finance Prof from under grad - did well in his course, no interaction

I am definitely including 1 and 3. But I am torn between the other 3. I like 4 because the PM really liked me and praised me, but he was not officially my manager because it was for a side co-op training program, although the we did this program each week over 4 months and I spent a lot of hours on top of my internship to do extra modeling work for him. Bottom line: it looks to be a good ref but it's legitimacy may be scrutinized. I like 2 but it is more so same as number 1. 5 is the weakest but it is a relevant subject and Prof

Thoughts?