(B) The acidity of hydrides of group $16$ elements increases down the group because the bond dissociation enthalpy of the $X-H$ bond decreases from to

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$O-H$ bond is stronger than $S-H$ bond

(B) The acidity of hydrides of group $16$ elements increases down the group because the bond dissociation enthalpy of the $X-H$ bond decreases from top to bottom.Since the $O-H$ bond is stronger than the $S-H$ bond,$H_2O$ is less acidic than $H_2S$.The order of acidity is $H_2O < H_2S < H_2Se < H_2Te$.