The decline of Tibet as a powerful kingdom happened? a. at the same time as the decline of the Tang dynasty b.during the Sui dynasty c. after the collapse of the Tang dynasty d. before the decline of the Tang dynasty

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http://en.wikipedia.org/wiki/Tuyuhun_Kingdom

How does your book define Tibet as a powerful kingdom?

To determine the correct answer to this question, we need to understand the historical context of Tibet and the relevant dynasties.

The decline of Tibet as a powerful kingdom happened after the collapse of the Tang dynasty.

To arrive at this conclusion, we need to examine the timelines of the various dynasties and the historical events related to Tibet. Here's how you can do it:

1. Begin by understanding the significance and historical context of Tibet. Tibet was an influential kingdom in Central Asia known for its unique culture, religion (Buddhism), and political power. It had a complex relationship with the dynasties ruling in China.

2. Next, understand the timeline of the relevant dynasties:

- The Sui dynasty ruled China from 581 to 618.
- The Tang dynasty succeeded the Sui dynasty and ruled from 618 to 907.
- After the Tang dynasty, China fell into a period of disunity known as the Five Dynasties and Ten Kingdoms (907-960).

3. Now, compare the timeline of Tibet's decline with that of the Tang dynasty:

- The decline of Tibet as a powerful kingdom occurred after the collapse of the Tang dynasty, during the period of the Five Dynasties and Ten Kingdoms.
- The Tang dynasty was still in power when Tibet was at its height as a powerful kingdom, and they had interactions, including conflicts and trade, during this time.

Based on this analysis, the correct answer is: c. after the collapse of the Tang dynasty.