Right answer is (a) Microorganisms
To elaborate: Simazine, Benomyle are basic insecticides used in the industry for production of insecticide in India, so, they are themselves categorized as toxic compounds and hence they do not degrade the complex lipophilic pesticide molecule, whereas, cytotoxic drugs are used as old expired medicines and hence, it’s not an insecticide. Microorganisms use enzymatic apparatus to cleave the complex lipophilic pesticide molecule, also, they are environment friendly.