Mark got into a car accident because he swerved to avoid a cat. For the rest of his life, he feels frightened and panicked when he sees a cat. What

Mark got into a car accident because he swerved to avoid a cat. For the rest of his life, he feels frightened and panicked when he sees a cat. What is the unconditioned stimulus?

A. The cat that caused the accident

B. The car accident

C. Any cat

D. The frightened feeling