Concept:Bonding pairs are the shared electron pairs that hold atoms together in a molecule.Explanation:Carbon(IV) oxide is CO2.Its Lewis structure is O=C=O.Each double bond contains two shared pairs of electrons, so there are two bonding pairs per double bond.There are two double bonds present in the molecule.Total bonding pairs =2×2=4.Carbon has no lone pairs in this structure.Therefore, CO2 contains four bonding pairs.Answer:A. 4