The correct option is A coordination
The process through which two or more organs interact and complement the function of one another is called coordination. Co-ordination in the body of almost all the higher vertebrates is controlled by two systems nervous system and endocrine system. Nervous system and endocrine system are called integrative system of the body.
Example-In case of physical work/exercise muscles, lungs, heart, brain and kidney work together to provide maximum resources to the body to fulfill its demand.
Homeostasis, as currently defined, is a self-regulating process by which biological systems maintain stability while adjusting to changing external conditions.
The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of electrical changes across the membrane of the neuron.
So the correct answer is "coordination".