Answer:
Mrs. thyberg is using (a) reward method to modify the children's behaviors.
Step-by-step explanation:
Using rewards in the classroom is a controversial teaching technique in which the teacher gives a prize to the students in order to manage behavior, motivate them or win their compliance. It can be positive to inspire the whole classroom but some teachers see the negative sides of it. One drawback can be that a student gets his unique motivation from the prizes and puts the learning on the second side.