请教大全170

1.                             Because the financial review covered only the last few fiscal years, and therefore the investigators were unable to determine the extent to possible earlier overpayments.

(A) and therefore the investigators were unable to determine the extent to possible

(B) so therefore the investigators were not capable of determining the possible extent of

(C) therefore the investigators were unable to determine the possible extent of

(D) the investigators were not capable of determining the possible extent of（E）

(E) the investigators were unable to determine the extent of possible

D和E的区别是什么，D为什么错呢？谢谢！

)fficeffice" />

D: the (possible extent) of earlier overpayments

Possible的修饰关系变了, 句子意思变了.

同问 。

另外

如果原文本来逻辑意思不妥，那么选项E的修改是不是意味着一个更好的答案呢？？