Over a second thought, this all process and skill check is to test to read between the lines. This is necessarily required in decision making. The GMAT test fabricators do this on purpose where the applicant faces a dilemma in an answer choice which feels good but is logically wrong. We are taught to eliminate the obvious visible wrong answer choices, but there comes a stage when you are trying to decide which out of the closest last two answer choices is the correct one. They say to make an intelligent guess at this juncture of decision making. Intelligent guessing - if proven right will never be called a guess then. That's what GMAT expects us to do, even if you are guessing something, you must guess it right.