Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Integrated use of phosphatic fertilizers and organic manure/crop residues increases P use efficiency by reducing P-fixation in soils. Reason R: Decrease in P-fixation in presence of organic matter in soils may be ascribed by formation of phosphohumic complexes that are easily assimilated by plants and formation of coating on the surface of sesquioxide particles. In light of the above statements, choose the most appropriate answer from the options given below