Why was the hijra a turning point for islam

The Hijra ("migration"), or Hegira, was a turning point in the history of Islam in that it was the point at which the religion was systematized into a community of Muslims. More specifically, the Hijra is the point at which Muhammad left Mecca and established the world's first Islamic state at Yathrib, renamed Medina, in present-day Saudi Arabia. Importantly, Muhammad consolidated his followers by breaking ties with his former tribe in demonstration of brotherhood with his new, more expansive and more spiritual one.

Explanation:

c is the correct answer for this question.