The word systems in dynamic systems refers to: a. each child is a well-integrated system with many subsystems. b. each child's subsystems operate discretely. c. each child is just one system. d. children's systems are disorganized and sometimes work against each other.

The correct option is A)  Each child is a well-integrated system with many subsystems.

Explanation:

Dynamic System Theory can be described as a motor development theory which doctors can use to treat patients with Cerebral Palsy.

The main idea of this theory is that multiple sub-systems are involved for the movement of a person. All of these sub-systems interact is specific ways to cause specific kinds of movements. It described that each child comprises of specific sub systems which make up the child.