What caused Muhammad to take the journey known as the Hijra? How did this affect the spread of Islam?

In 622, faced with the threat of murder, Muhammad and his followers left Mecca for Yathrib, a journey known as the hijra. Was welcomed by the Muslims and created rules that governed and united Muslims and brought peace amount of the clans of Medina

Explanation:

When city authorities learned that the Muslims had begun an exodus, they plotted to have the prophet killed. Under this threat, Muhammad slipped away unnoticed with a chief disciple and made his way to Medina, using unfrequented paths.

i think i agree because it is telling you to always believe in yourself.

answer; /// i believe that the correct answer is (d)the huang he river valley;