Answer:
Red Flower
Explanation:
An unconditioned stimulus is one that unconditionally, naturally, and automatically triggers a response. This being the case we can say that in this scenario the unconditioned stimulus is the Red Flower. This is because Frank associates the Red Flower with the bee sting that he suffered, therefore every time he sees or smells a red flower it automatically triggers the fear and pain that he felt when he was stung by the bee, which is why he immediately started to cry.
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