Your little brother has a habit of pestering you whenever you sit down to study, so you start one of his favorite videos to keep him occupied while you study and are pleased to note that it does, indeed, stop the pestering. Over time, you find yourself starting videos
more and more for him when you want to study or do other activities without interruption from him. This suggests that, for you, the
behavior of starting a video for your little brother has been
positively reinforced
O positively punished
O negatively reinforced
O negatively punished