The development of nation-states began
-during the development of early human societies
-immediately after the fall of rome
-before the age of empires
-in recent times

The correct answer is -in recent times

Nation-states are a relatively new concept because people did not feel their belonging to a nation to be something special. They would rarely even leave their villages before the 16th or 17th century and thus had not concept of a nationality being something important.