GWD 24-17

24-17 The yield of natural gas from Norway’s Troil gas field is expected to increase annually until the year 2005 and then to stabilize at six billion cubic feet a day, which will allow such an extraction rate at least for 50 years’ production.

A) 2005 and then to stabilize at six billion cubic feet a day, which will allow such an extraction rate at least for

B) 2005 and then to stabilize at six billion cubic feet a day, an extraction rate that will allow at least

C) 2005 and then stabilizing at six billion cubic feet a day, with such an extraction rate at the least allowing

D) 2005, then stabilizing at six billion cubic feet a day, allowing such an extraction rate for at least

E) 2005, then stabilizing at six billion cubic feet a day, which will allow such an extraction rate for at least

答案是B没错，再看过有点不明B和E A，到底E A错在哪，是不是修饰对象歧异？

A和E都用了which指代前面整个句子，这种情况一般都错

which不能指代前面的句子么？我记得可以啊！

请指教！