I say option C. With option A, how do you know you can recoup the tremendous opportunity costs and tuition costs for the MBA? Even if you graduate and land a baller job that pays 120k+, that job most likely comes with long hours. Have you necessarily improved your compensation to effort (or time) ratio vs. your current position?
Depending on how close you are to your S/O, it may be pretty sub-optimal to move away and try to carry on long-distance. Your personal life should factor into your decision as well. Also, bear in mind that statistically, MBA's are more likely to divorce than people with a BS/BA, although I don't have enough information to guess whether it's more of a correlation or a causation effect.
If you are not yet familiar, now would be a good time to read up on Prospect Theory too. In a nutshell, equivalent sized losses hurt psychologically roughly twice as much as equivalent sized gains. What if you take on the 6 figure tuition bill, and after graduating, you find that you can't really score a much higher paying position than what you have now? It might be more disappointing than if you lived your life with option C while wondering what you could have accomplished by going with option A.