求大神帮帮看看这道题。

In contrast to ongoing trade imbalances with China and Japan, the United States trade deficit
with Mexico declined by $500 million as a result of record exports to that country.
(A) In contrast to ongoing trade imbalances with China and Japan, the United States trade
deficit with Mexico declined by $500 million as a result of record exports to that country.
(B) In contrast to ongoing trade imbalances with China and Japan, the United States sold record
exports to Mexico, reducing its trade deficit by $500 million.
(C) When compared with ongoing trade imbalances with China and Japan, the United States
sold record exports to Mexico, reducing their trade deficit by $500 million.
(D) Compared with ongoing trade imbalances with China and Japan, the United States sold
record exports to Mexico, reducing the trade deficit by $500 million.
(E) Compared to ongoing trade imbalances with China and Japan, the United States record
exports to Mexico caused a $500 million decline in the trade deficit with that country.

此题答案是A BCDE答案上说是因为概念不对等。怎么样才是概念对等啊 还有这个句子的后半句应该怎么理解呢declined by $500 million as a result of record exports to that country？？

还有就是纠正你一下 就是。其实in contrast to比较的就是对象imbalances和trade deficit，并不是trade