Juanita is walking through a crowded amusement park with her two sons, 6-year-old Alec and Zac, who is almost 3 years old. What is the best explanation for why Zac keeps bumping into other people, while Alec is able to navigate through the crowd without bumping into anyone?
As a toddler, Zac has not developed adequate depth perception to judge the distance between himself and other people, while his older brother Alec has developed adequate depth perception.
As a toddler, Zac has poorer near vision, while his older brother Alec's near vision is more adult-like.
As a toddler, Zac is too focused on the rides to watch where he is going, while Alec, as a school-aged child, has a more mature orienting system of attention.
As a toddler, Zac is only capable of controlling his movements in relation to a stationary world, while Alec has mastered the ability to move capably in a changing environment.