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Special efforts to speed up walking fail if the infant is not:

Aphysically strong
Bmaturationally ready
Csocially active
Dmentally alert
Answer & Solution
Correct answer: B. maturationally ready
1. Walking and sitting depend on a physical structure that develops on a timetable. 2. Special efforts to accelerate these behaviours do not help if the infant is maturationally not ready. 3. So readiness limits what training can do. _Source: NCERT Class XI Psychology, Ch 3 Human Development, "Growth, Development, Maturation, and Evolution", p. 42_
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