Answer: Option A
Explanation:
The living things respond to the external stimuli. This is one of the most characteristic feature of the living things.
When any living being is exposed to an external stimuli then it will respond to the external stimulus. This is a property of all the living beings.
The external stimuli may be heat, change in temperature, change in pressure, change in the intensity of light, et cetera.
hence, the correct answer is option A
