A truly interesting dilemma with extreme options and bitter, ironic consequences...
As others have stated before, I believe the "sadistic god"'s credibility is pivotal in any reasoning.
First of all, what makes me believe in this god's ability to make the results and consequences a reality? If the given deity cannot condemn me to eternal suffering, free human beings from all which is perceived as suffering, control the beliefs of the entire human race, or inform every person of the bargain, the dilemma itself is nil. And even if the god is capable of bringing into action some but not all of the consequences, I would pick a "C) none of the above" just to see how much the god is capable of. In any way, I would be at the whim of what ever power the deity has anyways; as it doesn't seem too trustworthy.
But given the hypothetical situation that the sadistic god is capable of bring all and any of the consequences into reality, I would be left in a state of personal dissonance. The logical and self-preserving side of me would want to pick B, as I currently see neither wrongness nor goodness in this world, and "suffering" is a subjective perception most often thought to be only existent in certain organisms. As I know from experience that I am an organism capable of suffering, I would not think it would be prudent to put myself on the stake. I don't see many things wrong with a world that has suffering in it, either. But maybe it wouldn't be bad having a world without one, either. Even if "eternal suffering" means that I would forget the pain that occurred a millisecond ago and therefore have the suffering be new every moment, I feel that things won't matter after a while anyways, as I'm guessing the suffering is the only thing that will exist in my consciousness, whether it be physical or psychological. If my mind becomes fully immersed in such suffering, I assume I will be unable to make distinctions between what is pain and what is not. In the big picture, my personal suffering would matter very little, while my decision would have made a big change in the world, whether it be good or not. Maybe I would pick A, in fact.
We're all human beings, greatly dictated by emotion. I'm thinking the choice I would make in such a situation, A or B, would actually depend on small things such as mood and personal events of that day.