According to my research, "Before a bill can become a law, it must be approved by the U.S. House of Representatives, the U.S. Senate, and the President." of those answers provided, A is the only one that fits. If you're still having trouble, I'd suggest looking at the How A Bill Becomes a Law song by Schoolhouse Rock, which is pretty catchy, and explains how a bill becomes a law pretty well. Good Luck!
Explanation: The group now known as Sunnis chose Abu Bakr, the prophet's adviser, to become the first successor, or caliph, to lead the Muslim state. Shiites favored Ali, Muhammad's cousin and son-in-law. Ali and his successors are called imams, who not only lead the Shiites but are considered to be descendants of Muhammad.
