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sat语法题No one reason given for the fall of Rome,though many c

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sat语法题
No one reason given for the fall of Rome,though many causes have been proposed over the centuries,[are adequate explanations for] why the mighty empire did not last.
A 原句
B is an adequate explanation for
请问,为什么要选B,用单数呢?从哪个词看出的?那不是有many causes...
sat语法题No one reason given for the fall of Rome,though many c
many causes前面有个though 这一句是插入语 看前面No one reason判断.