High yield of aryl halide is formed in

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(B) The $Sandmeyer$ reaction is a well-known and efficient method for the synthesis of aryl halides from primary aromatic amines via diazonium salts.

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$Sandmeyer$ reaction

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(B) The $Sandmeyer$ reaction is a well-known and efficient method for the synthesis of aryl halides from primary aromatic amines via diazonium salts. It provides a high yield of aryl halides compared to other methods like the direct halogenation of benzene (which often leads to poly-substitution) or the reaction of phenol with $PCl_5$ (which gives poor yields of chlorobenzene). Therefore,the $Sandmeyer$ reaction is the most suitable for obtaining a high yield of aryl halides.

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