The correct answer is d) copper ii sulfite.
To explain, the chemical formula CuSO3 indicates that we have copper (Cu) combined with a sulfate radical (SO3). In this case, copper can have multiple oxidation states, but the ‘ii’ indicates that it is in the +2 oxidation state. That means it’s copper (II) combined with the sulfite ion, which is typically represented as SO3²⁻. Therefore, the full name for CuSO3 is copper II sulfite.