The disintegration of the Abbasid Caliphate most directly led to which of the following political developments in the Islamic world in the thirteenth century?
A. The Russian conquest of Central Asia
B. The rise of Turkic states
C. The conversion of most of the Islamic world to Shi‘a Islam
D. The collapse of trade along the Silk Road networks

This is a question on my AP World test and I really need help!!! Hopefully someone can help.