In a case whereby irina learned that when the light blinks on her desk, someone is at her office front door that needs to be let in. this learning is considered an conditioned stimulus.
A conditioned stimulus can be described as one of the most common type of response that do take place as a result of how the response is been triggered by the external factor.
It should be noted that this can be seen in the lives of the women because she can only know that someone is waiting for her when the bell is been rung.
Therefore, option C is correct.
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