GMAT Critical Reasoning (CR) | Re: Whales originated in the freshwater lakes and rivers of ancient - 2

I like this question. There aren't many people who have worked the problem yet, but it seems to be tricking most people.

Remember what you are trying to do on the problem. The correct answer will be one that should be true (or must be true) based on the facts presented in the argument. This problem really emphasizes the importance of eliminating your way to the right answer. Eliminate the ones that don't have to be true and you are left with the answer (and you will realize then, if you didn't
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