An organ intends to hold a special national defense education event on the National Defense Education Day. As for the form of the event, the organizers A. B, and C have the following opinions: A: If you are engaged in reading lectures, knowledge contests, then do not engage in cultural performances Thematic exhibitions. B: If you don't engage in literary performances and special exhibitions, then engage in reading lectures and knowledge competitions. C: Don't engage in reading lectures and knowledge competitions. The opinion of only one of the three mentioned above is consistent with the final result. which is the final result? ['Engage in reading lectures, knowledge contests, art performances and special exhibitions.', 'Engaging in reading lectures, knowledge contests, not performing art performances and special exhibitions.', 'Performing art performances and special exhibitions, not reading books, lectures, and knowledge contests.', 'Do not engage in reading lectures, knowledge contests, cultural performances and special exhibitions.']