Concept:Molecular shape depends on the number of bonding pairs and lone pairs around the central atom.Explanation:CH4 has four bonding pairs and no lone pair, so its shape is tetrahedral.NH3 has three bonding pairs and one lone pair, so its shape is trigonal pyramidal.H2S has two bonding pairs and two lone pairs, so its shape is bent.CO2 has two double bonds and no lone pair on the carbon atom, so its shape is linear.Answer:D. CO2