How did merchants accommodate the needs of west african kingdoms with trade goods?

Merchants brought several goods and salt in exchange for gold and other precious items like ivory, kola nuts, leather, dates and metal goods.  

Explanation:

The West African Kingdoms included Ghana, Mali, and Songhai. All three kingdoms situated near the Niger River. Trade became the main source of economy. The presence of gold in the empires helped in gaining their influence in Africa, flourish in trans-Saharan trade and with Europeans. European for the first time in the 15th century, came into contact with Africa, which led to the expansion in trade and slave trade.    

this question makes no sense dude

the answer would be c