Gesell's Work Involved Documenting the Motor Abilities and Physical Growth

Gesell's work involved documenting the motor abilities and physical growth of infants, including changing skills in prehension, which refers to

A) evidence of rolling and crawling.
B) early walking abilities.
C) voluntary lying down and sitting skills.
D) approaching, grasping, and releasing objects.
E) being able to sit up unaided.