The incorrect statement about Africa's early Aksum civilization is number 4.
The written language of Aksum was the Ge'ez. It has Arabic origins that were modified by the Greeks. Originally, Ge'ez was the liturgical language of the Ethiopian church. It also was spoken in some Arabic tribes of the time,
In this modern era, Ge'ez language is still used in some religious ceremonies in Ethiopia. They also use two derived languages called Amharic and Tigrigna.