Answer:
Conditioned Stimulus
Explanation:
Conditioned stimulus is a piece of the learning Classical Conditioning theory.
In this theory, a conditioned stimulus is defined as an impartial stimulus that after some time and training, inspires a reaction by over and again being connected with another naturally happening stimulus.
There is a possibility for a conditioned stimulus to condition the other stimulus.
Thus here in the case of rabbit, if the rabbit hears the crinkling noise just before Simon fed him, this would be the original conditioned stimulus.
If Simon takes the crinkling bag near the cage before using it, the rabbit will eventually associate Simon going to the cage with being fed.