求助啊（已解决）

Although the coordination of monetary policy can help facilitate the orderly financing of existing imbalances, it is unlikely that its effect on their size is significant
    in the absence of an appropriate fiscal adjustment.
(A) it is unlikely that its effect on their size is significant
(B) it is unlikely that the size of their effect would be significant
(C) affecting their sizes are not likely to be significant
(D) the significance of their effect on its size is unlikely
(E) its effect on their size is not likely to be significant

我当时在A，E 中犹豫，最后选了A，

答案是E

请大家帮我分析一下这题

(A) it is unlikely that its effect on their size is significant
(B) it is unlikely that the size of their effect would be significant

不正确的共同原因是:unlikely后面不能接从句,他的用法是--+to+v.(见朗文高阶字典1916面)

B不对还有:1.the size of their effect 改变句子的意思了.

          2.would be---要用情态动词的完成体

C  affecting their sizes are not likely to be significant 

D. the significance of their effect on its size is unlikely         

their指代不对,他指代的是不平衡,而事实上句子的意思是coordination of monetary policy 的作用.