The major motor achievement of infancy is

A) talking.
B) walking.
C) running.
D) touching.

Walking is considered the major motor achievement of infancy as it marks a significant milestone in a child's development. It requires the coordination of several different motor abilities, such as balance, strength, and coordination, as well as cognitive and perceptual abilities. While talking and running are also important motor skills, they typically develop later in infancy and early childhood. Touching is not considered a major motor achievement as it is a basic sensory-motor ability that is present from birth.