8=(√59−√51)(√59+√51) 8=(√37−√29)(√37+√29) We know that, √59+√51 is greater than √37+√29 This implies, √37−√29 is greater than √59−√51 as the product is constant. Similarly, √59−√51 is greater than √79−√71 and √79−√71 is greater than √87−√79. The correct order is B>A>D>C The answer is option D.