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
A.复数those不能指代单数level，因此只能强制指代前句的复数主语emissions，那么，句子变成将level与emissions相比较，比较对象不对等
B.正确。
C.主语应该使用will，而不是would
上述是官方解释，那么请问，A是否后面改为单数（than was it），C用了will（than it was），就都成立呀？
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