"which region shows how far islam had spread 100 years after muhammad's death?

c
a
b
d

Based on the given image above, the correct answer would be C. The region that shows how far Islam had spread 100 years after Muhammad's death is region C. Muhammad and his followers spread the teachings of Islam throughout the Arabian peninsula. After his death,  expeditions such as "openings" have emerged into what is now Egypt and other parts of North Africa. Hope this answer helps.