The statement that best explains how the scholar class evolved during the Song Dynasty is:
Scholars had to be familiar with Confucian texts to serve in the government.
During the Song Dynasty, there was a strong emphasis on Confucian education, and passing the civil service exams, which were based on Confucian texts, was essential for individuals who wanted to hold government positions. This led to the rise of the scholar-official class, which played a significant role in governance and society.