One of the most outstanding developments after the Hijrah was the
- increase in cooperation with the Jews
- emergence of a new religion
-
emergence of the Muslim
- increase in hostilities against the Muslims
The correct answer is: C
Explanation
The Hegira is the migration or journey of the Islamic prophet Muhammad and his followers from Mecca to Yathrib, later renamed by him Medina, in the year 622.
Muslims ummah is a theory that no matter where you come from, as long as you are a Muslim, you are a member of a worldwide family.
Prophet Muhammud migration (Hegira) brought about this development.