Answer:
Positive reinforcement
Explanation:
Positive reinforcement refers to giving something to the subject (specifically something he/she likes) as a reward when a behavior takes place.
The subject will start associating this reward with the behavior and therefore, he/she will make it more often.
In the example Jennifer loves the music the radio channel plays so the music acts as a reward and therefore she plays the radio channel (behavior) more frequently and whenever she wants to listen to music.