The important achievements of the Kushites among the given options are:
- The development of Africa's first iron-working city
- The famous text, The Book of the Dead
- Trade networks that stretched from Greece to south of the Sahara
(Note: The defeat of the Assyrian army is not attributed to the Kushites; rather, the Kushites were involved in battles against the Assyrians, but they ultimately faced defeat. The invention of one of the world's first alphabets and the invention of papyrus are also not credited to the Kushites specifically.)