(A) कार्बन डायऑक्साइड
(B) मिथेन
(C) ऑक्सीजन
(D) इनमें से कोई नहीं
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(A) कार्बन डायऑक्साइड
(B) मिथेन
(C) ऑक्सीजन
(D) इनमें से कोई नहीं