I voted for option 3, and as for my reasons, Fordim already explained them quite well.
As far as why, or how consciously, I find it interesting to speculate about - was it the oath he had made on "the precious" and broken? Was it (as I'm inclined to believe) the hatred of the ring that coexisted with his love for it: the "Smeagol" side of him hating what it had done to him? Or was it as another poster suggested on the "hero of the third age" thread, love for Frodo?
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