Allowed inputs for organic production are:

Correct option is A

The correct answer is (A) Manure, compost, Elemental Sulfur and Rock phosphate

Explanation:
• Organic farming prohibits the use of most synthetic fertilizers and pesticides.
• Manure and Compost: Fundamental sources of organic matter and nutrients.
• Elemental Sulfur: A naturally occurring mineral used for soil pH adjustment and as a fungicide.
• Rock Phosphate: A natural mineral source of phosphorus, allowed because it is not chemically processed (unlike Single Super Phosphate).

Information Booster:
• Glyphosate (in Option B): A synthetic herbicide, strictly prohibited.
• Chlorpyriphos (in Option C): A synthetic organophosphate insecticide, strictly prohibited.
• Imidacloprid (in Option D): A synthetic neonicotinoid insecticide, strictly prohibited.

Additional Knowledge:
• Bone meal and Blood meal (Option B) are actually allowed organic inputs, but the presence of Glyphosate in that list makes the whole option incorrect.
• The general rule is: 'Natural is allowed, Synthetic is prohibited', with some specific exceptions on the National List of Allowed and Prohibited Substances.