Which of the following is an appropriate expectation for the physical development of a 4-year-old?

A 4-year-old typically exhibits significant advancements in gross motor skills, which include running, jumping, throwing, and climbing. By this age, children are expected to run with improved coordination and balance, which means they can run without tripping. This ability reflects the development of their muscle strength, balance, and coordination.

While the ability to throw a ball underhand may also be seen around this age, it is more of a developing skill than a definitive expectation. Jumping over a hurdle and climbing a ladder unassisted are skills that generally surface later, as they require a greater degree of balance and coordination that typically develops in children aged 5 and older. Therefore, the ability to run without tripping is a more age-appropriate expectation for a 4-year-old's physical development.