If current trends continue, by the year 2010 carbon emissions in the United States will soar to a level more than one-third higher than were those in 1990, according to official projections.
(A) will soar to a level more than one-third higher than were those (B) will soar to a level more than one-third higher than that (C) would soar to a level more than one-third higher than it was (D) would soar to a level more than one-third higher than those (E) would soar to a level more than one-third higher than they were
正确答案是B，请问D错在哪里？是would和they were吗？这里不是虚拟语气，所以would错；they指代carbon emissions in 2010而不是carbon emissions in 1990，所以错误吗？
不知道我的理解对不对呢 | 
