Nano urea has been developed by

Correct option is A

Nano urea was developed by Indian Farmers Fertiliser Cooperative Limited (IFFCO) as an innovative nitrogen fertilizer. It uses nanotechnology to enhance nitrogen use efficiency by crops through better absorption and utilization. Hence, the correct developer of nano urea is IFFCO.
Information booster: Nano urea contains nitrogen in nano-sized particles, which increases its surface area and effectiveness. It reduces the requirement of conventional urea and helps in lowering environmental pollution caused by excess nitrogen. The product supports sustainable agriculture by improving nutrient efficiency and reducing fertilizer losses. Nano urea has been promoted as part of modern input management strategies in Indian agriculture.
Why other options are incorrect: (b) KRIBHCO is a fertilizer cooperative but did not develop nano urea. (c) Chambal Fertilizers produces conventional fertilizers, not nano urea. (d) Govt. of India supports promotion but is not the developer of nano urea.