请教大全987-48

1.        According to some analysts, whatever its merits, the proposal to tax away all capital gains on short-term investments would, if enacted, have a disastrous effect on Wall Street trading and employment.

(A) its merits, the proposal to tax

(B) its merits may be, the proposal of taxing

(C) its merits as a proposal, taxing

(D) the proposal’s merits, to tax（A）

(E) the proposal’s merits are, taxing

答案是A，E为什么不对？我觉得E的结构更完整，taxing away...这个行为作主语．

请NN赐教

taxing away这个行为不能enact么？