The river that ran along much of the Songhai Empire is B - Niger.
The river that ran along much of the Songhai Empire was the Niger River, which is option B. To arrive at this answer, you can use a few different methods. One approach is to search for information about the geography of the Songhai Empire. Another approach is to search for the major river systems in Africa and then find out which one runs through the territory occupied by the Songhai Empire. In this case, searching for the major rivers in Africa and their associated empires would lead you to the Niger River as the correct answer.
