Mr. Pietrzyk teaches first grade. In his classroom there is ample time for peer collaboration and cooperation on projects. Mr. Pietrzyk believes that children's learning is supported by their social interactions. Mr. Pietrzyk learned this concept through the study of theory.

Vygotsky's  

Explanation:

Vygotsky's theory states about development of cognition that takes place through social interactions. He believed that child development can be driven through socio-cultural aspects,language,psychological tools,proximal development zone etc.

According to the question, Mr. Pietrzyk's thinking about children;s development and learning through social interaction is depicting Vygotsky's   theory.This helps them in peer meeting and groupings.

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