When Battu is practicing piano, his mother rewards him by occasionally giving him a hug. This is best described as an example of a ________ schedule.

When Battu is practicing piano, his mother rewards him by occasionally giving him a hug. This is best described as an example of a ________ schedule.

When Battu is practicing piano, his mother rewards him by occasionally giving him a hug. This is best described as an example of a ________ schedule.



a. VI
b. VD
c. VR
d. VT


Answer: B