The correct answer is B. Froebel.
Friedrich Froebel (1782-1852) was a German educator who developed the kindergarten system of education. He believed that children learn best through play and interaction with their environment. He also believed that education should be child-centered, meaning that it should focus on the needs and interests of the child.
Dewey, Plato, and Spencer were all philosophers who had a significant impact on education. However, they did not develop the kindergarten system of education.
Dewey (1859-1952) was an American philosopher and educator who believed that education should be based on the needs of the child. He also believed that education should be a social process, meaning that it should involve interaction with others.
Plato (428-348 BC) was a Greek philosopher who believed that education should be based on the study of the classics. He also believed that education should be a preparation for life in the polis, or city-state.
Spencer (1820-1903) was an English philosopher and sociologist who believed that education should be based on the principles of evolution. He also believed that education should be practical, meaning that it should prepare students for life in the world.