A response is how an organism answers to a change in its environment, which is option B. Details about response can be found below.
A response in biology refers to any behavior of a living organism that results from an external or internal stimulus in the environment.
A stimulus is something external that elicits or influences a physiological or psychological activity or response.
Therefore, it can be said that a response is how an organism answers to a change in its environment (stimulus).
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