What happened in 632? A Muhammad heard the voice of God, or Allah in Arabic, speaking to him and began spreading Islam. B Muhammad died. C An Italian mathematician brought the Arabic numerals to Europe. D Babur founded the Mughal Empire.

After the death of Muhammad in 632 CE, the young Muslim federation came under strain. Some of the tribes decided that as their loyalty to Islam had been primarily to Muhammad himself, his death allowed them to end their allegiance to Mecca and to Islam.

i think the answer is B