10.   During the 1980’s approximately $50 billion in private investment capital is estimated to have left Mexico and added to the strain on the country’s debt-ridden economy.

(A) During the 1980’s approximately $50 billion in private investment capital is estimated to have left Mexico and added

(B) During the 1980’s it is estimated that approximately $50 billion in private investment capital left Mexico and added

(C) It is estimated that there was approximately $50 billion in private investment capital that left Mexico during the 1980’s and added

(D) It is estimated that during the 1980’s approximately $50 billion in private investment capital left Mexico, adding（D）

(E) Approximately $50 billion in private investment capital is estimated as having left Mexico during the 1980’s, adding

不知道该选哪个,请nn们指教

楼上,偶有点不太明白题干的意思，能帮忙翻译一下么...thanks!