A four-year-old child can hop on one foot.

The assertion that a four-year-old child can hop on one foot is generally true. At this age, children typically display improved gross motor skills, which include activities such as jumping, running, and hopping. Many four-year-olds are able to hop on one foot for a short distance, demonstrating their developing balance and coordination.

While it's true that individual physical abilities can vary among children, the general developmental milestone for hopping is reached around the ages of three to four years. Thus, most children in this age group should be able to perform this skill, making the statement that a four-year-old can hop on one foot accurate. This developmental capability highlights their growth in physical skills and body awareness, which are crucial for further motor development.