Correct answer: (a) 1, 2 and 3 only
Explanation
- A
1, 2 and 3 only
1, 2 and 3 only. Crop diversification, legumes, tensiometers — eco-friendly as keyed. Vertical farming is not counted in this trio.
- B
3 only
3 only. Under-counts.
- C
4 only
4 only. Vertical farming is the dropped limb.
- D
1, 2, 3 and 4
All four. Vertical farming is not keyed with the other three.
Summary. Official key is (a) 1, 2 and 3 only. Diversification, legume intensification and tensiometer-guided irrigation are the eco-friendly set. Vertical farming is not in the official four.
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