Research Done from a Dynamic-Systems Perspective Demonstrated That _____Helped Infants

Research done from a dynamic-systems perspective demonstrated that _____helped infants succeed at A-not-B tasks.

A) giving the baby more time to think about the location of the object after it was hidden in location B
B) allowing the baby to reach for the object in location A multiple times
C) placing weights on the baby's arms before hiding the object at location B
D) All of the answers are correct.
E) None of the answers is correct.