The Second Historical Resolution points out that Mao Zedong Thought is the application and development of Marxism–Leninism in China, the correct theoretical principle and experience summary of China's revolution and construction proved by practice, and the crystallization of China's collective wisdom. The resolution stressed: "Mao Zedong Thought is a valuable spiritual wealth of our party and will guide our actions for a long time." The answer is ABCD.