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B
Farmyard manure and green manure
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C
Farm refuse and household refuse
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D
Organic wastes from which biogas has been extracted
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Solution
The correct option is D Rotten vegetable and animal refuse The compost manure is a mixture of decayed or decaying organic matter used to fertilize soil. It is usually made by gathering plant material, such as leaves, grass clippings, and vegetable peels, into a pile or bin and letting it decompose as a result of the action of aerobic bacteria, fungi, and other organisms.
So the correct answer is ' Rotten vegetable and animal refuse'