The correct response is "two ionic bonds."
In the formation of carbon dioxide (CO2), carbon, which typically forms four bonds, does so by creating double bonds with each oxygen atom, resulting in a total of two covalent bonds (not two ionic bonds or any metallic bonds).
However, CO2 is formed through covalent bonding, not ionic or metallic. Therefore, a more accurate understanding is that carbon forms two double covalent bonds with the two oxygen atoms in CO2.
The answer should reflect "two double covalent bonds" (in some discussions noted as having four total covalent bonds), but since that option is not available, the above selections are misleading.
In summary, the best way to describe the bonding in CO2 would involve two double covalent bonds, but that option isn't present. If you're limited to choosing one from the options provided and interpreting based on overarching concepts, the reference to "covalent bonds" should be noted because CO2 is a molecular compound formed through covalent bonding.