Test analysis: this small question examines Confucius' educational thought. The theories of "rule by virtue" and "benevolence" in A and D are all political thoughts of Confucius.
B it is an educational idea to ask students to have an honest learning attitude, but it only refers to students' learning attitude and does not involve educational equity; "Setting up a private school" means that before Confucius, ordinary people did not have the right to receive education, that is, they studied in the government. Confucius founded a private school to recruit disciples, regardless of family background and wealth, so that many people who could not receive education also had the right to receive education. Since then, private schools have begun to rise, and academics have gone down to the people, becoming popular and civilian. This is definitely a way to promote educational equity.