请教PREP中的第12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.

答案是A，此题我知道in contrast to前后要用对等的概念，但是对B中的结构不是很清楚，谓语到底是哪一个？是sold?  麻烦NN能指点一下！谢谢！