What did africa have to trade for the spices, tapestries and glass beads of china, india and the ottoman empire?

a) cotton and slaves
b) salt and slaves
c) salt and gold
d) ivory and ebony

Africa had to trade for cotton and slaves for the spices, tapestries and glass beads of china, India and the Ottoman Empire

Explanation:

Towards the western verge of the Silk Road is the Ottoman Empire. Present day turkey is the place which was ruled by ottoman Turks and Silk Road extended from china to central Africa. Cotton which was the primary crop of west Africa was traded on the silk road with China in exchange to porcelain, glass products and silk and spices.  

Ottoman Empire which also merchandised on the Silk Road procured the slaves of Africa. Central African slaves were purchased by Ottoman Turks. Under Islamic law slaves were to be fed with food and shelter and they have to be given good care by their owner. Slaves were also made unrestrained and were given an opportunity to start a new life with. Ottoman Turks were religious and treated slaves as part of their family.

the china one is last

explanation:

a. "how old man winter was driven back” and “ormuzd and arimanes"