The correct option is
D X - Spinal cord, Y - Motor neuron
- Reflex action is a spontaneous involuntary and nerve-mediated response to a specific stimulus produced.
- X is the spinal cord. First of all, sensory organs receive stimuli, sensory neurons process it through the spinal cord and convey the impulse received from the receptor to Y.
- Y is the Motor neuron. Motor neurons present in the spinal cord transmits the impulse to the effector organs from the brain. Effector organs respond to the impulse received from the motor neuron.
Thus the correct answer is option B.