Sentence Correction (SC) | Re: The discovery that Earths inner core rotates independently

Very long and intimidating, but at its core, this problem is not too complex, and rests largely on understanding the author's intended meaning.

"The discovery that..." should alert you that there subject-verb agreement is going to be tested. Anyway, continue reading. Original sentence too wordy, but the author's intended meaning is clear: the discovery is responsible for something.

Vertically scan the answer choices. Eliminate C and D for wrong subject-verb agreement. discovery is
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