(B) The peroxy linkage is defined as an $O-O$ bond where oxygen is in the $-1$ oxidation state.In $H_2SO_5$ (Caro's acid),the structure is $HO-S(=O)_2

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(B) The peroxy linkage is defined as an $O-O$ bond where oxygen is in the $-1$ oxidation state.In $H_2SO_5$ (Caro's acid),the structure is $HO-S(=O)_2-O-OH$.Here,the $S-O-O-H$ group contains the peroxy linkage $(-O-O-)$.Other options like $H_2S_2O_3$,$H_2S_2O_7$,and $H_2S_4O_6$ do not contain an $O-O$ bond.