Which of the following statements is correct?

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(B) The correct statement is $B$. Excessive use of chemical fertilizers leads to nutrient runoff into nearby water bodies,causing eutrophication,which

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Excessive use of chemical fertilizers leads to eutrophication in nearby water bodies.

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(B) The correct statement is $B$. Excessive use of chemical fertilizers leads to nutrient runoff into nearby water bodies,causing eutrophication,which results in algal blooms and depletion of dissolved oxygen. Option $A$ is incorrect because maize can be grown using organic farming methods. Option $C$ is incorrect because while both are nitrogen fixers,$Azotobacter$ is a free-living bacterium,whereas $Rhizobium$ forms symbiotic associations in root nodules. Option $D$ is incorrect because while $Anabaena$ and $Nostoc$ are important for nitrogen fixation and organic matter addition,they are not primarily known for mobilizing phosphate and potassium; that role is typically associated with phosphate-solubilizing bacteria $(PSB)$ like $Bacillus$ or $Pseudomonas$.

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