Mode of action of spiromesifen is

Answer: Option C

Mode of action of spiromesifen is inhibitor Lipid biosynthesis.
Spiromesifen is a novel insecticidal/acaricidal compound derived from spirocyclic tetronic acids that act effectively against whiteflies and mites via inhibition of acetyl-CoA-carboxylase, a lipid metabolism enzyme.
It acts on lipid synthesis by inhibiting acetyl CoA carboxylase and causes a significant decrease in total lipids.