Which goals of science are reflected in the use of reinforcement principles to modify a child's unruly behaviour

A)  understanding and prediction 
B)  application and control 
C)  measurement and description 
D)  testing and reporting

The use of reinforcement principles to modify a child's behavior reflects the goals of application and control, which involve using scientific knowledge to solve practical problems and exert control over behavior. The other goals of science, such as understanding and prediction, measurement and description, and testing and reporting, may also be involved to some extent, but they are not as directly applicable in this context.