As chldren enter toddlerhood, they begin to imitate parental activities when they are alone. this is the..?

I would say it's the beginning of symbolic play. Not the best example, but that's the most appropriate answer. Group play is when children actually interact w/ each other and play together. This begins around preschool age.Toddlers usually engage in parallel play which means playing next to each other or with the same toy but not really together