Final answer:
The correct name for CuO is copper(II) oxide, reflecting the +2 oxidation state of the copper in this compound.
Step-by-step explanation:
The correct name for CuO is D: copper(II) oxide. This is because the compound CuO is made up of copper and oxygen in a 1:1 ratio. Copper in this compound has an oxidation state of +2, as each oxygen atom has a charge of -2 (O2-), which is balanced by a copper ion with a +2 charge (Cu2+). This information can be deduced from other similar compounds, like iron(II) oxide (FeO) where iron has a +2 charge, and copper(I) oxide, which has copper with a +1 charge (Cu2O). Thus, to reflect the oxidation state of copper in CuO, it is appropriately named copper(II) oxide.