[讨论]GWD7-Q1有问题~

GWD7-Q1:

Although producer prices rose at an unexpectedly steep rate in September, analysts said that the increase resulted mostly from temporary factors and not necessarily foreshadowing that there would be a resurgence of inflation.

A.     factors and not necessarily foreshadowing that there would be

B.      factors and not necessarily that it foreshadowed

C.     factors and did not necessarily foreshadow

D.     factors, while not necessarily a foreshadowing of

E.      factors, while it did not necessarily foreshadow that there would be

选C啊~请问XDJM们while的用法啊？是修饰？伴随？还是...？while后面的部分与主句关系是怎样的呢？

谢谢啦~