If A not contact you, pass. B sounds like a little nerd. I guess

If A not contact you, pass.

B sounds like a little nerd. I guess he wants to do background check on you.
It's OK if you give the true information.

For what I read from yourself, I feel B is more safe than A. And B said for 1 on 1, it's nerd talk, it's OK...

Try to know more about B or continue to see more...

Good luck!