What would you do?

well i would keep it with me and feel lucky as i need money at this time!

Pick it up and announce If anyone had lost something if they say yes have them describe it.

take it away and if i find a beggar or anyone in need i would give it to them

i would go with option C and just pick it up without feeling guilty.i'll tell you how the money has a chance of going back to the one who dropped it.when u buy something with that money(which i obviously would) it will rotate and has a remote chance of going back to the same person who dropped it.
So dont think so much to pick it up.

I am too much of a goody two shoes when it comes to things like this. I start to think about the poor person who lost it and how they can't pay their bills or feed their children.... Usually I hold on to the money and if I found it in a parking lot I go into the store, tell the manager I found some money - and not the amount. I give my phone number and tell them if someone lost money to call me. If they have the right amount I give it to them. If no one calls after a time I keep it. Most people here won't call the police department if they lose money... so if it's loose money I don't turn it in to the police. They'll just keep it. If I find a wallet I do turn it into the police with everything as I found it.

Well here in Portugal it not like in England,because if I took too the police one of them would keep it,they are not too be trusted,so in this case I would keep it,lol
(knowing my luck some portugues police officer has read my post and I get arrested,lol)

If there was some way to find out who genuinely owned it then I would give it to who it belonged to, because they could well need the money more than me...however if there was no way to to find out I'd probably keep it.