Which of the following describes a key difference between the tang and song dynasties?

This question is incomplete; here´s the complete question.

Which of the following describes a key difference between the Tang and Song dynasties?

A. The Song dynasty experienced a Golden Age, while the Tang dynasty did not.

B. The Song dynasty expanded the borders of the Chinese Empire, while the Tang dynasty did not.

C. The Song dynasty developed gunpowder weapons, while the Tang dynasty did not.

D. The Song dynasty lasted nearly 300 years, while the Tang dynasty did not.

C. The Song dynasty developed gunpowder weapons, while the Tang dynasty did not.

Explanation:

Although gunpowder was first discovered during the late Tang dynasty, it was during the Song dynasty that the earliest record of a formula for gunpowder was written, and then applied into siege warfare, leading to the construction of the first rockets, cannons, bombs, and mines.

First used as an incendiary compound, gunpowder became extensively used by both the Chinese and the Mongol armies during the 13th century.

letter d is correct.

first paragraph (and busy all the night ,with a silence deep and white )