In which one of the following is higher percentage of carbon found ?

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Q: 64 (CDS-I/2009)
In which one of the following is higher percentage of carbon found ?
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question_subject: 

Geography

question_exam: 

CDS-I

stats: 

0,142,42,15,15,12,142

keywords: 

{'lignite coal': [0, 0, 2, 0], 'peat coal': [0, 0, 1, 0], 'bituminous coal': [0, 1, 0, 0], 'anthracite coal': [0, 0, 1, 0], 'carbon': [1, 0, 4, 5], 'higher percentage': [0, 1, 1, 0]}