TPR Biology Passage 2 in Workbook

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chrissyo

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In TPR's Science Woorkbook under Biology Passage 2, #5... I really don't understand the justification for why the answer is D... the answer in the solutions seem contradictory. I thought the answer was C because of the fact that the other instance provided in the passage stated that "CO2 molecule was discovered to be labeled with 100% of the 14C".

Can anyone help?
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