Which One of the Following Statements Best Describes a Theory

Which one of the following statements best describes a theory theory view of cognitive development?

A) Children form general belief systems about how the world operates.
B) The ways in which children organize and integrate their experiences usually have little relevance to physical reality.
C) In the early years, children develop concrete understandings of events; these understandings become increasingly abstract as they reach adolescence.
D) Beginning at around age 3, children form hypotheses about the nature of the world and test those hypotheses in much the same way that a scientist would.