Two toddlers of the same gender, age, culture, and physical ability level live in two apartments in the same house. One child lives upstairs and must climb many steps to reach her family's apartment. The other child lives downstairs and never climbs steps. Based on classic research on motor development, which of the following is the most likely outcome?
◦ The toddler who lives upstairs will acquire stair-climbing abilities earlier than the other child and will maintain this motor advantage through the preschool years.
◦ The toddler who lives upstairs will acquire stair-climbing abilities earlier than the other child. These motor advancements will generalize to other play skills. So, the upstairs child will surpass the downstairs child in many abilities, even in elementary school.
◦ There will be no difference in any aspect of motor development between the upstairs and downstairs toddlers.
◦ The upstairs toddler will acquire stair-climbing abilities earlier than the downstairs toddler. The latter child will catch up in this area of motor development within a few months.
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