Critical Reasoning (CR) | Re: For years, scientists have proposed the idea that Mars was o

GMATNinja : Can you please clarify a doubt here. I believe that this question is wrong. The official source says that B is the answer. But my question is that Option B mistakes a could be true answer to something that is definitely true. What I mean is that the argument first of all says the ridges of rock seem to be a shoreline(so this is a kind of a week assumption, not something hard and solid) and then it showcases that a shift of mass would ideally point towards the fact that these shore lines