This is a inference question and right approach is to try to prove a choice is wrong else it is the answer. I have tried the same over here. Please someone help me to sort it out.
A. If it is determined that the ridges of rock in the northern hemisphere of Mars were never smoother than they now are, oceans did not exist on the planet. ---scientists have proposed the idea that Mars was once covered by two huge oceans, so lets not think about it. very unlikely for this choice to be true.
B. The
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A. If it is determined that the ridges of rock in the northern hemisphere of Mars were never smoother than they now are, oceans did not exist on the planet. ---scientists have proposed the idea that Mars was once covered by two huge oceans, so lets not think about it. very unlikely for this choice to be true.
B. The
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