A 4-year-old patient in the hospital is observed talking to himself while playing with medical equipment. According to Vygotsky's sociocultural theory, this behavior is best described as:
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A
A sign of cognitive delay and egocentrism.
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B
A manifestation of the preoperational stage.
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C
Private speech, used for self-guidance and problem-solving.
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D
An indicator of insecure attachment to his caregivers.