Physical Development Is Characterized by Both Differentiation and Integration

Multiple Choice

Physical development is characterized by both differentiation and integration. Which statement best describes the functioning of these two processes in physical development?

A) There is a period of differentiation followed by a period of integration.
B) There is a period of integration followed by a period of differentiation.
C) Differentiation and integration occur simultaneously and interactively.
D) Their relative importance varies depending on the physical system in question.