A
Test question analysis: This question examines the development process of Chinese characters and calligraphy. According to what we have learned, it was during the Wei and Jin Dynasties that Chinese characters developed into a conscious art of calligraphy. During the Southern and Northern Dynasties, item A was in cursive script, which is consistent with the meaning of the title; item B and CD were in oracle bone script, official script, and small seal script, which was not consistent with the meaning of the title.