[DONTUSETHIS]

This is way out of my league but I will take a shot:

A. I think this has the tightest range becuase of the odds that the pot will be offering Allen to call you I would say A10+ and 66+

B. I think the same answers apply for B & C because for C if you raise and he puts you all in you will be getting almost 2 to 1 to call and have too much of your stack in the middle to fold if you were playing too win I think.
If he limps I would push with 44+ and KQ+. Maybe my thinking is wrong, but like I said this is way out of my league and I also think this is a tricky spot because of the pot odds that will come up for either person if thier is a raise and a reraise.