Mary is three years-old, and in preschool. Identify the development period that Mary is currently in.

Answer:Early childhood

Explanation: Early childhood is the development periods from Zero to So years, in this development stage the child is either an Infant, kindergarten or first grade. During early childhood children usually partake in Ball games like throwing and cathing using large balls, children starts to walk, jump, running etc during this stage of development, children to develop cognitive and language, children starts to understand the cause an effect of some the activities they engage in.