Which of the following is NOT a part of physical development?

Cognitive reasoning does not fall under physical development because it pertains to the mental processes associated with knowledge, understanding, problem-solving, and decision-making. This area of development is a component of cognitive development, which involves skills such as memory, attention, and thinking.

In contrast, brain development refers to the physical changes and growth of the brain itself, influencing a child's abilities and behaviors. Small motor skills involve the coordination of small muscles, typically in the hands and fingers, facilitating tasks like writing and buttoning clothing. The coordination of muscle groups relates to larger movements and overall physical abilities that promote physical health and activity. Each of these aspects contributes directly to the physical capabilities of a child, which is why cognitive reasoning stands apart from physical development.