Which of the following was the largest obstacle preventing unification of the italian states? a. different languages were spoken in different states. b. there were not enough strong leaders to champion the cause. c. the pope directly controlled a large area in central italy. d. common people did not support unification.

The correct answer is D.

Internally, the unification movement faced the problem of localism. The local rulers did not want to see Italy united, as they feared they would lose their privileges and individuality. Italy was divided into eight separate states and each of them had their own system of government and interests.  

these civilizations were located around fertile rivers, where they could produce an abundance of crops