Exаmine the fоllоwing tаble, which shоws groundwаter pollution levels Landfill Nitrate Concentration (mg/L) Heavy Metal Concentration (mg/L) A 45 2.5 B 20 1.2 C 5 0.5 D 30 1.8 Which landfill most likely used clay soil instead of a plastic liner at the bottom of the landfill? Choose all that apply