请教一道题，谢谢

Charles6246

Paleontologist believe that fragments of a primate jawbone unearthed in Burma and estimated at 40 to 44 million years and provide evidence of a crucial step along the evolutionary path that led to human beings.

a, at 40 to 44 million years old provide evidence of
b, as being 40 to 44 million years old provides evidence of
c, that it is 40 to 44 million years old provide evidence of that was
d, to be 40 to 44 million years old provide evidence
e, as 40 to 44 million years provides evidence of what was

请问A为什么不好？谢谢

skycircle

句子说的是什么学家相信怎么样的碎片为一个什么理论提供了证据。

从句的主语是FRAGMENTS,谓语是PROVIDE。

UNEARTHED IN BURMA和ESTIMATED TO BE都是修饰FRAGMENTS的定语。

A选项ESTIMATED前的AND和什么平行呢？而且如此一来PROVIDE前的AND也无法解释。

拙见。本人语法也甚为丢人，可能解释的不很清楚。