Two Three-Year-Olds Are Playing in a Hospital Playroom Together

Two three-year-olds are playing in a hospital playroom together. One is working on a puzzle, while the other is stacking blocks. The mother of one of the children scolds them for not sharing their toys. The nurse counsels this mother that this is normal developmental behavior for this age, and the term for it is:

A) Cooperative play.
B) Solitary play.
C) Parallel play.
D) Associative play.