From the time that Islam first spread through the Arab world, it would have taken another 100 years for Islam to reach Central Asia because Islam spread as a Arab empires expanded into the region. Option A is correct.
Islam is an Abrahamic, monotheistic, universal religion preaching that there is only one God, called Allah, and that Muhammad is the messenger of God. It constitutes the world's second-largest religion.
According to Islam beliefs, God is merciful, all-powerful, and unique, and has guided humankind through prophets, revealed scriptures and natural signs.