The correct options are
A Shia's believed on Ali.
D Sunni's believed on Khalifas.
There are the Shia Muslims, who believed that Prophet Muhammed’s son-in-law, Ali, was the legitimate leader of the Muslim community. While, on the other hand, the Sunni leaders only accepted the authority of early leaders of the community and their successors. These leaders were called Khalifas. This suggests that there was division among people in Islam too.