Which of the following pesticides is expected to persist in the environment for longer period as…

Dieldrin is an organochlorine pesticide, chemically stable, fat soluble and highly resistant to degradation, so it persists for years and bioaccumulates. Parathion and malathion are organophosphates and carbaryl is a carbamate, all of which hydrolyse and break down comparatively quickly. Hence dieldrin persists longest.