C
Esquilax is right - I don't think we're going to end up with pet bears or wolves, and C is giving us a nice option that doesn't actually advance any time in the world - so it doesn't screw us on the barbarian horde front. It almost seems as if we needed to do this to assuage the Codexians' speculations on the mystery animal, but now I think we're better off thinking about metallurgy, stonework and other techniques that can lead us to proper weaponry, fortifications and architecture in the long run.
Also, sorry, but m4davis' arguments mostly flew past me in their unhinged, manic craziness, their ferocious speed unleashed by a total lack of punctuation.