Final answer:
Document C is from 'The Analects of Confucius' and focuses on teaching moral principles. Document D is from 'The Legacy of Confucius' and highlights the importance of Confucius.
Step-by-step explanation:
The document labeled as Document C is from the source titled 'The Analects of Confucius'. This document consists of twenty short books with excerpts from Book 2, which contains short quotations on various themes. The author of this document primarily focused on teaching people how to become compassionate and moral beings, known as junzi, and emphasized the importance of fulfilling ancient ritual obligations.
On the other hand, the document labeled as Document D is from the source titled 'The Legacy of Confucius'. This source briefly discusses the importance of Confucius for Chinese culture, philosophy, and history. It also mentions Mencius as one of Confucius's influential disciples.