The correct option is C It can be both (A) and (B)
Some examples for mixed oxides containing cations of more than one element include ilmenite (FeTiO3), a mixed oxide of iron (Fe2+) and titanium (Ti4+) cations and for mixed oxides containing cations of one element with different oxidation states is magnetite Fe3O4, which contains the cations Fe2+ ("ferrous" iron) and Fe3+ ("ferric" iron) in 1:2 ratio.