Answer:
Conditioned
Step-by-step explanation:
The conditioned stimulus can be defined as a substitute stimulus that produces the same response in living beings. Conditioned Stimulus is a part of Classical Conditioning, in which classical response is attained when conditioned stimulus combines with an unconditioned stimulus.
In the given case, Irinia's picking up the leash has become a conditioned stimulus for her dog; indicating to go for a walk. So, when Irinia picked up a bungee cord, her dog responded because he is conditioned to respond to Irinia's picking up the cord.
Therefore, a conditioned stimulus is the correct answer.