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B. U.S. officials have imposed sanctions on three Kuwaiti financiers and pressured Kuwait, Qatar and other Persian Gulf allies to stop the flow of money. In addition to money from rich backers in the Gulf, ISIS has stolen and extorted many more millions in the territories it conquered.
A. Between 90% and 95% of Iran's 78 million people are Shia Muslims – more than any other nation. But, Shia Muslims constitute only 10% to 20% of the world's Muslim population.
C. Qatar's sole land border is with Saudi Arabia to the south. Saudi Arabia's leaders adhere to Salafism, a conservative form of Sunni Islam, and ISIS aims to create a Salafist state in Iraq and Syria. Saudi citizens compose the largest contingent of foreign fighters in ISIS.
D. Other than Iran and Iraq, all the nations on the Persian Gulf are either absolute or constitutional monarchies. In June, ISIS declared its occupied territories a caliphate, which is an Islamic state led by a supreme religious and political leader known as a caliph – or "successor" to Muhammad.