Richard is teaching his son, cody, to throw darts. at first, he gives cody a piece of candy each time the dart hits the dartboard. as time progresses, richard starts only rewarding cody when the dart hits one of the inner rings of the dartboard. finally, richard only rewards cody when he hits the bullseye. this example best illustrates the concept of

Shaping

Explanation:

Shaping is a term used to describe the process where a response is stimulated through small rewards or punishments. In other words, shaping refers to a situation where a person is gradually trained to establish some kind of behavior or skill through small incentives. An example of this can be seen in the question above, where a parent shapes his child's aim by offering candy whenever he hits the target.

it would be a gas formation