CORRECT answer is All of the above The Umayyad dynasty was brought down by a well-organized movement called 'Dawa'.The MAIN center of their UPRISING was the distant region of Khurasan.The movement was started by Abu Muslim from Khurasan against the Umayyad dynasty.The event is given the name of the Abbasid Revolution. The Umayyad projected themselves rested on force and LOYALTY of Syrian TROOPS which resented the Arab soldiers.The Arab civilians disliked the Umayyad regime for failure to fulfill their promises.Umayyad regime was portrayed as evil by the Abbasids only to their advantage.