When Rosemary Was Seven Years Old, Her Older Brother Jumped

When Rosemary was seven years old, her older brother jumped out from a hiding spot and grabbed her unexpectedly, just as she was about to go upstairs.As an adult, she is still terrified of stairs.Based on classical conditioning principles, a behavioral therapist would suggest the unconditioned stimulus behind Rosemary's phobia was:

A) the fear and arousal she experienced when her brother grabbed her unexpectedly
B) the set of stairs she was about to climb when she was grabbed unexpectedly
C) her brother grabbing her unexpectedly
D) the fear and anxiety that she now experiences when she thinks about stairs

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