Which of the following pesticides is expected to persist in the environment for a longer period as compared to others?

Dieldrin is an organochlorine pesticide that resists breakdown and persists in soil and tissue for years.

Parathion is an organophosphate that degrades comparatively quickly in the environment.

Malathion is another organophosphate with low persistence and rapid breakdown.

Carbaryl is a carbamate that also breaks down relatively fast.

Organochlorines like dieldrin accumulate in fatty tissue and magnify up food chains.

Their persistence led many countries to ban this class of pesticides.