Final answer:
The autonomic nervous system is responsible for the involuntary control of the body's organs, maintaining homeostasis through its sympathetic and parasympathetic subdivisions. It works with the central nervous system, which is comprised of the brain and spinal cord. The correct option is A.
Step-by-step explanation:
The system that supplies neural input to organs that run the involuntary processes of the body is the autonomic nervous system (ANS). This system is responsible for the involuntary control of the body, especially for maintaining homeostasis.
It is comprised of the sympathetic nervous system and the parasympathetic nervous system, which have complementary functions. For example, the parasympathetic nervous system directly controls the digestive system by managing digestion and energy conservation, whereas the sympathetic nervous system prepares the body for stress-related activities.
The central nervous system, which consists of the brain and spinal cord, works alongside the autonomic nervous system in processing information and controlling the body.