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411.In the late seventh century, in a dispute over whether the Prophet Muhammad’s son-in-law, Ali, should carry on as the fourth caliph, Muhammad’s successor, Islam split into two branches, the Sunnis and the Shiites.
(A) over whether the Prophet Muhammad’s son-in-law, Ali, should carry on as the fourth caliph, Muhammad’s successor
(B) over if Ali, the Prophet Muhammad’s son-in-law, was going to carry on and be the fourth caliph, Muhammad’s successor
(C) over whether Ali, the Prophet Muhammad’s son-in-law, was going to carry on and be the fourth caliph, Muhammad’s successor
(D) as to whether the fourth caliph, Muhammad’s successor, is to be the Prophet Muhammad’s son-in-low, Ali
(E) concerning if the fourth caliph, Muhammad’s successor, was to be the Prophet Muhammad’s son-in-law, Ali

答案是a

不过如果是a

那么不是有那么一条规定

说主语和谓语之间如果没有其他成分，中间就不能用逗号吗~？