Which of the Following Is an Example of a Persistent

Which of the following is an example of a persistent pollutant?

A) Carbon monoxide that breaks down after reacting with oxygen.
B) DDT which is found in soil years after its use but is eventually destroyed by soil bacteria.
C) Organophosphate insecticides that kill insects for several days but do not bioaccumulate in food chains.
D) Bacteria in treated sewage sludge that is spread on fields.
E) None of these is an example of a persistent pollutant.