The cities of ___________ and ___________ formed important centres of trade in the ___________.

Kilwa; Mapungubwe; Indian Ocean trade network
Turfan; Java; Indian Ocean trade network
Java; Kilwa; Silk Road
None of the above

None of the above

The cities of Kilwa and Mapungubwe formed important centres of trade in the Indian Ocean trade network.

The cities of Kilwa and Java formed important centers of trade in the Indian Ocean trade network. To arrive at this answer, let's break down the options:

1. Kilwa and Mapungubwe: Mapungubwe was an ancient kingdom in southern Africa, and while it did engage in some trade, it was not a significant center in the Indian Ocean trade network. Therefore, this option is incorrect.

2. Turfan and Java: Turfan is an oasis city in the Xinjiang region of China, and it was a part of the Silk Road trade network. While Turfan did play a role in trade, it was not a major center in the Indian Ocean trade network. So, this option is also incorrect.

3. Java and Kilwa: Java is an island in Southeast Asia, historically known for its trade networks and the production of valuable commodities such as spices. Kilwa, located on the eastern coast of Africa, was a thriving port city and a prominent center in the Indian Ocean trade network. Therefore, this option is correct.

4. None of the above: Since option 3 (Java and Kilwa) is the correct answer, "None of the above" is not the correct option.

In conclusion, the correct answer is: The cities of Kilwa and Java formed important centers of trade in the Indian Ocean trade network.