The correct answer is option d, that is, neurotransmitters.
A neurotransmitter refers to a chemical component, which is discharged at the terminal of a nerve fiber by the introduction of a nerve impulse, and by diffusing across the junction or synapse. It helps in the transfer of the impulse to another muscle fiber, nerve fiber, or some other composition. Acetylcholine is a kind of neurotransmitter, that is, used by neurons in the CNS and the PNS in the control of activities ranging from heart rate and muscle contraction to digestion and memory.
C. “ an economic and political system in which a countries trade and industry are controlled by private owners for profit rather than by the state”
6 CO2+ 6 H20-> C6H1206+ 6 O2
It could be C but the best option would be B: they make their own food.