Which is a major source of argument between Sunni and Shia Muslims? A. Whether Mecca is the holy land
B. When Islam was founded
C. Whether the Quran is a holy text
D. Who would lead Islam after Muhammad

The correct answer is D. Who would lead Islam after Muhammad.

Explanation

Islam is a religion that ranks second in importance with about 1.8 billion followers worldwide. The origin of this religion dates back to the 7th century when the prophet Muhammad began to spread the teachings of (Allah the god of Muslims). Once Muhammad died in 632, leaving no male offspring, his death triggered a power struggle between his followers. From there arose the two main branches of Islam, Sunnism, and Shiism, who clashed to decide who had the legitimate right to lead Muslims. D. Who would lead Islam after Muhammad.