Question

Imagine that you flinch after seeing lightning because in previous instances the lightning is followed by thunder, which scared you. in this scenario, lightning can be interpreted as being a(n) unconditioned stimulus. unconditioned response. conditioned stimulus. conditioned response. extinguished stimulus

Answer 1

I believe the answer is: Conditioned Stimulus

Conditioned Stimulus refers to a situation when a previously neutral stimulus which overtime cause you to make an automatic response for that stimulus. 
This happen when you're exposed to a certain trigger over and over again which make your body create a pre-determined response for that trigger