讨论一题

763.The guiding principles of the tax plan released by the Treasury Department could have even a greater significance for the economy than the particulars of the plan.
(A) even a greater significance for the economy than
(B) a significance that is even greater for the economy than
(C) even greater significance for the economy than have
(D) even greater significance for the economy than do
(E) a significance even greater for the economy than have
the key

如果选项中有个even greater significance for the economy than could，能不能选

I think yes. As normally the guild lines and the particulars of the plan took effect from the same day, as explained in the book of LZM.