What's the difference between the approaches of Nancy Bayley and Emmi Pikler when it comes to evaluating babies' development? A. Pikler's evaluation methods take into account that babies should be confined for safety, while Bayley's are based on letting infants have free movement. B. There's not much difference between their approaches—Bayley was a student of Pikler. C. Pikler's evaluation methods are based on testing situations while Bayley's are meant to be diagnostic. D. Bayley evaluates babies by manipulating them to see what they do; Pikler observes what they do on their own.

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The answer for this is "D. Bayley evaluates babies by manipulating them to see what they do; Pikler observes what they do on their own."

Nancy Bayley used a lot of measures and scales of infant development, one task of which is to record the observations made of how a child responds to the task that is presented. Emmi Pikler however, wanted the child to learn naturally if possible, without the child being stimulated to a movement or environment.