With reference to soil conservation, consider the following practices:  

1. Crop rotation 2. Sand fences 3. Terracing 4. Wind breaks

Which of the above are considered appropriate methods for soil conservation in India?
(a) 1, 2 and 3 only (b) 2 and 4 only (c) 1, 3 and 4 only (d) 1, 2, 3 and 4


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(d) All are soil conservation methods.

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