Jick Magger
Arcane
Yeah, gonna go with B as well, A doesn't give us any advantage, D is too far up the mountain, and C, though it could be well-defended, will also be a severe impairment should we need to escape suddenly and quickly.
All options offer benefits, but A is the least tanglible as B & C seem to offer a definite alternative food source. It would be good to get to A and B in time, but for now I think C (sheep or goats?) fits in best with our existing taming skills. It would be good to upgrade from eating horse all the time.
I'm slightly concerned that they 'strange creatures' will turn out to be Shoggoths and the story will take a sudden Lovecraftian turn.