Consider the following statements: A - Biogas is an eco-friendly source of energy. B - Biogas production is an aerobic process. C - Methanogens are obligate anaerobes. D - Biogas can be used for lighting and cooking.
- AA, B and C are correct
- BA, C and D are correct
- CB and D are correct
- DAll are correct
✓ Correct answer: B
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