Answer:
The correct answer is -The brain and the spinal cord respond and sends a signal down a motor neuron to a specific sensory stimulus.
Step-by-step explanation:
Sensory receptors sense the changes that take place in the environment that is called stimuli by sensory neurons that transmit the signal from the sensory receptors to the brain.
The brain and the spinal cord make the central nervous system. This coordinates a response to a specific stimulus and sends a signal down a motor neuron and send a signal to the effector by motor neurons.