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
答案选B，an extraction rate that....是作同位语成分吗？修饰的前面整句话？ | 
