Concept:Progressive education, as proposed by John Dewey, focuses on learning through hands-on experience and social interaction, not just from textbooks.Explanation:Progressive education promotes 'learning by doing' and group work. Students actively participate and apply practical knowledge. John Dewey believed that learning is a social process. A school is a reflection of society, so learning has a social character. Textbooks are de-emphasized; multiple resources are used. Seating arrangements and curricula are flexible, not fixed or standardized. Thus, the key feature is that learning is social and collaborative.Answer:Option A: learning has a social character.