The message travels along a nerve fibre in the form of
impulse
The correct option is C.
Explanation of the correct option :
Explanation of the incorrect option:
Option A:
Stimulus is defined as the change in the environment that can trigger a physical change in the body.
Option B:
Response is the immediate action taken by the nerve cells when it receives a signal.
Option D:
Reflex is the automatic response to the action of a stimulus.
Final answer: The message travels along a nerve fibre in the form of impulse.