A. Hazrat Hamza R.A
B. Hazrat Abu Bakr R.A
C. Hazrat Ali R.A
D. Mus‘ab bin ‘Umair R.A
Explanation:
Mus’ab ibn Umayr was appointed the first ambassador of Islam and was sent to Yathrib (Medina) to prepare the city for the forthcoming Hijra after the first pledge with the ansar. A man of Medina named Asad ibn Zurarah assisted him.