How did the song improve upon the tang version of the civil service system?
they mandated that most officials came from the military.
they made the examinations easier to pass.
they opened up the system to more people.
they required students to earn their degrees in three years.

The correct option is "They opened up the system to more people. "

The Tang dynasty was the successor of the Sui dynasty and predecessor of the period of the Five Dynasties and the Ten Kingdoms in China. The dynasty was interrupted by the second Zhou Dynasty (690-705), when Empress Wu Zetian usurped the throne and founded her own dynasty. The Tang dynasty, with its capital in Chang'an (present-day Xi'an), the most populous city in the world at that time, is considered by historians as a moment of splendor of Chinese civilization, equal to -or even superior- to of the Han period.

rescuing someone who is in danger. hope this : )