As She Walked Through Her Neighborhood,Jodie,a 6-Year-Old Girl,frequently Saw a Large

As she walked through her neighborhood,Jodie,a 6-year-old girl,frequently saw a large brown dog.She walked to the dog to pet it,but as her hand approached the animal,it barked and bit her.The bite was painful and caused her to cry.Now Jodie cries when she sees dogs of any color or size.The sight of dogs is the

A) US.
B) CS.
C) UR.
D) CR.