Irinia's Dog Loves to Go for Walks,and She Always Puts

Multiple Choice

Irinia's dog loves to go for walks,and she always puts a leash on him when they go out.The dog used to wag his tail as soon as they got outside,but now he wags his tail when Irinia picks up the leash.In this case,what is the conditioned stimulus?

A) Irinia
B) The leash
C) Going for a walk
D) The wagging tail