​Which group of pesticides,after being applied,would persist in an area the longest? 

A)  ​contact insecticides 
B)  ​carbamates 
C)  ​pyrethroids 
D)  ​chlorinated hydrocarbons

Chlorinated Hydrocarbons

Chemical compounds containing chlorine, carbon, and hydrogen, which are used in industrial applications but can be harmful to the environment and health.

Pesticides

Chemical substances used to kill or control pests including insects, weeds, and disease-causing organisms, in agricultural and residential settings.

Contact Insecticides

Chemical substances that kill insects upon direct contact.