In which pair does the named element have the same oxidation number?
(A) sulfur in H2S2O7 and in H2SO4
(B) mercury in Hg2+ and in Hg 22+
(C) oxygen in Na2O2 and in H2O
(D) cobalt in Co(NH3)63+ and in Co(NO3)2
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Based on our data, we think this problem is relevant for Professor Hinton's class at UTOLEDO.