Correct option is B
The central nervous system (CNS), which comprises the brain and spinal cord, is the control center where input (sensory) and output (motor) nerves meet and interact. Sensory nerves carry signals from various parts of the body, such as skin, muscles, and organs, to the CNS. These signals are processed, and in response, the CNS sends motor commands through output nerves to initiate actions like muscle contraction or gland secretion. The liver and heart are important organs but do not serve as junctions for nerve signal processing. The CNS not only processes sensory inputs but also integrates complex information from different sources to create coordinated responses. For example, touching a hot surface triggers sensory nerves to send a signal to the CNS, which processes the information and sends motor signals to pull the hand away. The reflex arcs and voluntary control both depend on this meeting point in the CNS, making it essential for regulating the body's functions.
