... , water molecules containing oxygen-18 are rarer than water molecules ... water molecules containing oxygen-18 than of all water ... -than-normal percentage of oxygen-18.
(C) ... clouds rainfall contains more oxygen-18 than ordinary oxygen.
...
I got this question correct by POE, but I don't have any clue why C is something the author would most likely to agree with. Can someone point to where this idea is supported in the passage? Also, why is answer choice D explicitly incorrect?
I don't understand how A is the principle. Here is my breakdown:
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