Mehmed II

A.
conquered much of Sub-Saharan Africa in the name of the Ottoman Empire.
B.
relied on religious thought to unify the different parts of the Ottoman Empire.
C.
attempted to unify the lands of the Eastern Roman Empire into the Ottoman Empire.
D.
unified the Western and Eastern Roman Empires in the name of the Ottoman Empire.

C. attempted to unify the lands of the Eastern Roman Empire into the Ottoman Empire.