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Nuria watches a ball fall and wants to understand how gravity works better. She wonders whether weight or shape affects how quickly things fall and guesses that weight matters more. She tests her theory by first dropping balls of different weights, then by taking lumps of clay that weigh the same and dropping them in different shapes.

What Piagetian stage is she in?

A

Formal operational.

B

Postconventional.

C

Abstract operational.

D

Concrete operational.

E

Sensorimotor.

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