Lydia, a 14-month-old baby, likes to play with small pots and pans as they make noise. She enjoys the sound but often gets bored after a short time. She then beats different containers to make different types of sound. In the context of Piaget's cognitive-stage theory, Lydia's action is an example of
A. mental combinations.
B. tertiary circular reactions.
C. secondary circular reactions.
D. primary circular reactions.
Answer: B
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