Among the following fertilizers which one having highest solubility in water?

Answer: Option C

Among the given options, Urea is the nitrogenous fertilizer for the amide group. It contains nitrogen in amide form but this form of nitrogen is swiftly converted by soil microorganisms into ammonical form and then into nitrate form.
Urea is a white crystalline solid containing 46% of nitrogen as an animal feed additive and fertilizer.