Final answer:
Du Bois complimented Booker T. Washington on his idea that education must be practical and his success in aiding black farmers.
Step-by-step explanation:
Booker T. Washington and W. E. B. Du Bois were two prominent black leaders with different perspectives on the challenges faced by black America in the early 20th century. While Du Bois had criticisms of Washington, he did find some aspects to compliment about him. Du Bois complimented Washington on his idea that education must be directly practical and useful to be most effective. He also complimented Washington's success in taking advantage of existing racial attitudes to provide aid to black farmers.