Islamic Caliphates spread Islam throughout the region during the post classical period and this statement best explains why Islam is an important religion in many parts of northern Africa today. The correct option among all the options that are given in the question is the third option or option "c".<span />
The management of charter colonies was carried out through the system of already established or newly formed traditional institutions of local power included in the general administrative scheme, while other colonies maintained traditional management systems, but adapted them to the needs of the colonial power.