8-month-old Baby Lucy picks up a toy in her crib and accidentally hits her crib with the toy making an interesting noise. She begins to drag the toy back and forth against the sides of the crib's railing which produces another different and interesting sound. This prompts Lucy to continue repeating the action over and over again. Piaget would say that this is an example of

Secondary circular reaction

Explanation:

During this substage, the child becomes more focused on the world and begins to intentionally repeat an action in order to trigger a response in the environment. If is the third stage of sensorimotor stage as proposed by piaget and it usually occurs between 4-8 month olds children as seen in this question.

Substage 3 (Secondary Circular Reactions)

Explanation:

The infant begins to interact with objects within the environment. At first the infant interacts with objects (such as toy ) accidentally, on the other hand these contacts with the objects are deliberate and become a repeated activity.

there is an explationation of this on a site called crash   course world history 1

the answer is a. monarch