Какие вещества 1, 2, 3, 4 входят в цепочку преобразований?

[tex]\displaystyle\\Cu \:^1 \rightarrow CuO \:^2 \rightarrow CuSO_4 \:^3\rightarrow\:CuCl_2\:^4\rightarrow Cu (OH) _2[/tex]


а) H2, H2SO4, HCl, KOH

б) O2, H2SO4, BaCl2, NaOH

в) H2O, SO3, NaCl, NaOH

г) O2, SO3, HCl, H2O
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