Laura watched a public service announcement to curb smoking in which a young boy describes how his mother died from lung cancer after smoking for 20 years. In this example the unconditioned response would be

The correct answer is : Sadness regarding a mother's death.

Explanation:

It refers to the situation in which a natural reaction occurs when an unconditioned stimulus is presented. It automatically triggers a response. Remember that this reaction is innate and natural, it is not learned. This natural reaction to something happens without behavioral modification.

is this even a question? ? : /