I: When a hydrocarbon is combusted in air, carbon monoxide is the major product
II: Air contains much more nitrogen than oxygen.

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Solution

When a hydrocarbon is combusted in air, carbon monoxide is the major product.

$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

Air contains much more nitrogen than oxygen.

Both the statements are correct and the statement II is correct explanation for statement 1
So the answer would be TTCE.

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