Researchers had children sort picture cards by shape. Then they asked the same children to sort the same cards by color. They found that children under the age of 4 _____.

Question

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The question states that the researchers asked the same children to sort the same cards by color after they had sorted them by shape. This indicates a task switching scenario where the children are required to switch their sorting pattern. The question then asks about the performance of children under the age of 4 in this scenario. Option D suggests that these children had difficulty changing to a new sorting pattern, which is a plausible explanation based on their age and cognitive development. Option A and B suggest that switching sorting patterns was easy for these children, which is not supported by the question's scenario. Option C suggests that children could switch to sorting by color but not by shape, which is not logically consistent with the scenario.

Researchers Had Children Sort Picture Cards by Shape