Well at first glance at this, I picked A. I will try to explain my answer, but keep in mind it's 7:15 AM here and I have not been to bed yet.Ok, so for starters you are pretty much pot committed to A by the turn. 300 +300 +100 chips in pre-f + 25*5 (antes) = 825. So if you have 2k to start you now have 1675. Now the only thing I would've done differently happens post flop. If you're going to flat call, knowing you're still calling on the turn, you should re-raise your opponent here. But anyway, back to the point at hand. You flat call so pot is 825 + 700 + 700 = 2225 and you now have 975 chips. So you are basically getting like 2.4 to 1 on your money. Justifiable call, but I still like the push approach better.Btw, since you said your hand was suited, and I'm assuming it was not K10 of spades, since that would be a no brainer, and assuming the turn does not put a flush draw out there you've got a 26% chance to win the pot or so.Keep in mind that your K or even possibly your 10 may still be live depending on your opponents hand, unless of course he holds AA, KK 2p or a set.It helps also, to have a predetermined amount of units that you are willing to spend on R/A tourneys. A lot of players get carried away in the donkfest that is the first stage and often find themselves at a disadvantage when trying to keep a +ROI in the long run..02