The earliest slave trade was across the Sahara. Slaves were brought up the Niger River to Timbuktu and transported across the Sahara into North Africa. Which of the following was necessary before large numbers of slaves could be moved across the desert?

Question

The earliest slave trade was across the Sahara. Slaves were brought up the Niger River to Timbuktu and transported across the Sahara into North Africa. Which of the following was necessary before large numbers of slaves could be moved across the desert?
boats from Egypt
 B. 
horses from South America
 C. 
camels from Arabia
 D. 
wagons from Europe

GPT 3.5 · Answer

C. camels from Arabia