Kipsigi and West Indian infants walk considerably earlier than North American infants because
A) the babies are smaller at birth, requiring less leg-muscle strength for standing.
B) they have a genetic tendency toward early motor development.
C) North American babies are mentally overstimulated, resulting in less motivation to walk.
D) their parents emphasize early motor maturity, practicing formal exercises to stimulate particular skills.
D
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What will be an ideal response?
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