In a school in the U.S., recess combines all children from each class outside at once. Given the research, which of the following is a likely playgroup for a five- to six-year-old on that playground?

a. girls and boys playing together
b. children from different grades playing together.
c. children from the same grade/age playing together.
d. children not playing

C. Typically, children in Western cultures play with children of the same age and same gender as them in early childhood.