Analysis of test questions: This question mainly examines students' ability to solve problems by using what they have learned. Du Fu, a great poet in the Tang Dynasty, was known as the "sage of poetry", while Li Bai, a great poet, synthesized "Du Li". Du Fu's poems have the characteristics of depression and frustration, which profoundly reflects the disasters and sufferings suffered by the people when the Tang Empire turned from prosperity to decline, and the material "sage in poetry"; The meaning of "people's sufferings" is the same, so the answer is that the outstanding achievement of item c. A lies in the Songs of the South, and item B is a famous poet and patriot in the Song Dynasty.