The statement that best explains how the scholar class evolved during the Song Dynasty is:
D. Scholars had to be familiar with Confucian texts to serve in the government.
During the Song Dynasty, the civil service examination system was emphasized, and it required candidates to have a deep understanding of Confucian texts. This emphasis on education and Confucian philosophy helped elevate the scholar class, as those who succeeded in the examinations gained significant political and social status.