Q. Which of the following statements can help in water conservation in agriculture?
1. Reduced or zero tillage of the land
2. Applying gypsum before irrigating the field
3. Allowing crop residue to remain in the field
Select the correct answer using the code given below:

[A] 1 and 2 only

[B] 3 only

[C] 1 and 3 only

[D] 1, 2 and 3

Answer: C