Fossil evidence??

Well as I would say it's B and or A, I do like to know stuff like this and I do study it. C you said stabilizing and I could guess you mean carrying capacity(in a way) I think it would have no effect on it. D just seems like a far stretch as because even thought we have great technology right now we have not proved anything evolved from anything else, like a straight up evolution with nothing in between. I would think out of a or b, a just makes more sense from close relationships!