Which of the Following Is Accurate About Polychlorinated Biphenyls (PCBs)

Multiple Choice

Which of the following is accurate about polychlorinated biphenyls (PCBs) ?

A) PCBs are naturally generated through biological interactions, but also synthesized industrially.
B) PCBs greatly affect the biomass of plants, which rely on nitrogen fixation.
C) PCBs accumulate in river systems via agricultural run-off.
D) PCBs, such as DDT, are beneficial in their role of saving human lives.