In December 2012, farmers in Jinshan Village, Panyu District, Guangzhou used fertilizers generated from garbage to grow vegetables, resulting in heavy metal elements in the soil seriously exceeding standards, triggering public

The official test results of heavy metals in soil are that the cadmium content exceeds the standard by 0.59 mg/kg and the lead content exceeds the standard by 60 mg/kg. The cadmium and chromium here refer to whether they exist in the form of simple substances, molecules, atoms, etc. What is meant here The "cadmium and chromium" are elements that emphasize their existence and have nothing to do with their specific forms.

So choose A.