Official Explanation.
For this question, you need to strengthen the conclusion that the poles are currently in the process of reversing. Choice A actually weakens the conclusion because the magnetic pole’s shifting away from true north would be a sign of the poles shifting. Choice B also weakens the conclusion, as 780,000, rather than a million, years have passed since the last reversal. Choice E weakens the conclusion as well, because it again suggests stability in the poles. Eliminate C because
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For this question, you need to strengthen the conclusion that the poles are currently in the process of reversing. Choice A actually weakens the conclusion because the magnetic pole’s shifting away from true north would be a sign of the poles shifting. Choice B also weakens the conclusion, as 780,000, rather than a million, years have passed since the last reversal. Choice E weakens the conclusion as well, because it again suggests stability in the poles. Eliminate C because
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