Why are the majority of Sub-Saharan African cities located along major rivers and the coast? A) they grew up because of internal tribal wars B) they needed access to bodies of water for trade C) the interior is filled with desert and mountains D) the exterior is filled with desert and mountains

B - They needed access to bodies of water for trade.

Explanation:

Sub Saharan African cities are endowed with resources. These resources have been a major source of their living and survival. The abundant resources necessitate them to trade and exchange these resources even beyond there geographical boundaries. With the presence of water, it is thus easy to trade and cross materials beyond their borders. Water is life. It is also a means of transportation. This thus facilitate the marketing and exchange of resources among the sub Saharan region.

B) they needed access to bodies of water for trade

Explanation:

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)