Progressivism mainly emphasizes:

The correct answer is Practical education. Progressivism, as a philosophy of education, mainly emphasizes practical education and learning by doing. It advocates for an experiential curriculum that focuses on solving real-world problems and developing skills relevant to life. Progressivists believe that education should be student-centered, promoting active engagement, critical thinking, and social development, rather than rote memorization of abstract theories. The curriculum is often interdisciplinary and flexible, responding to the interests and needs of the learners.

• Abstract ideas (A) are more emphasized by philosophies like Perennialism, which focuses on timeless truths and intellectual development through classic works. Progressivism critiques excessive focus on abstract concepts without practical application.
• Theoretical concepts (C) are certainly part of education, but Progressivism prioritizes their application and understanding through experience rather than their mere memorization or abstract study.
• Methods (D) are important in any educational approach, but 'practical education' specifically captures the core emphasis of Progressivism regarding the *type* of learning and content, rather than just the instructional techniques used.