alleryStart learning →Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?
AHydrogen, Oxygen, Sodium
BCarbon, Hydrogen, Nitrogen
COxygen, Calcium, Phosphorus
DCarbon, Hydrogen, Potassium
Answer & Solution
Correct answer: B. Carbon, Hydrogen, Nitrogen
UPSC CSE Prelims 2012 (GS-I, Set A), Q.63. Answer key: B (coaching consensus; UPSC did not publish an official 2012 AK separately on upsc.gov.in).
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