Neonicotinoids act on the central nervous system of insects through binding of the:

Correct option is B

Neonicotinoids, a class of systemic insecticides, act by binding to the post-synaptic nicotinic acetylcholine receptors (nAChRs) in the central nervous system of insects. This binding leads to overstimulation and paralysis, eventually causing the death of the insect.
Thus, the correct answer is (b) Post synaptic nicotinic acetyl choline receptor.