Which one is systemic insecticide?

Answer: Option C

Endosulfan is systemic insecticide.
Endosulfan is an off-patent organochlorine insecticide and acaricide that is being phased out globally. It became a highly controversial agrichemical due to its acute toxicity, the potential for bioaccumulation, and role as an endocrine disruptor.
Technical endosulfan is a non-systemic contact and stomach insecticide. It consists of the diastereomers α- and β-endosulfan in the ratio 7 : 3. Both are nonchiral and have significantly different physicochemical properties.
Endosulfan has been used in agriculture around the world to control insect pests including whiteflies, aphids, leafhoppers, Colorado potato beetles and cabbage worms.