请教白勇语法： section 7－18

18. Sales of United States manufactured goods to nonindustrialized countries rose to $167 billion in 1992, which is 14 percent more than the previous year and largely offsets weak demand from Europe and Japan.
(A) which is 14 percent more than the previous year
(B) which is 14 percent higher than it was the previous year
(C) 14 percent higher than the previous year's figure
(D) an amount that is 14 percent more than the previous year was
(E) an amount that is 14 percent higher than the previous year's figure

答案是E，为什么不是B，应该怎么分析？谢谢