Sorry for digging up the old question. I accept that B is the right answer, but just want to clarify a thing. The question is comparing people 'who run three days a week' and people who 'do not' (people who 'do not' could be running less or not running at all). I eliminated (B) because I thought it ...

in terms of meaning, the only necessary distinction is "reasonable meaning vs. nonsense meaning". the meaning of the original is immaterial; any sentence with a meaning that makes sense in context , and that isn't too farfetched or implausible, is acceptable. put another way, it should ne...