Final answer:
Carbamates are insecticides that inhibit the activity of acetylcholinesterase, which is an enzyme involved in the transmission of nerve impulses in insects. They are most toxic to mosquitoes.
Step-by-step explanation:
Carbamates are insecticides that inhibit the activity of acetylcholinesterase, which is an enzyme involved in the transmission of nerve impulses in insects. The toxicity of carbamates is highest to mosquitoes, as they are highly susceptible to the inhibition of acetylcholinesterase.
For example, carbamates such as dichlorvos, malathion, and parathion are nerve agents that have little effect on humans and other mammals, but are highly toxic to mosquitoes.
Therefore, the correct answer is b) Mosquitoes.