求助Gwd语法，（2.5 考试，急啊）

各位好ＸＤＪＭ，菜鸟我又来请教了，

Q39:

Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.

A.      Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.

B.       Nearly 99 percent of five hundred million different species of living creatures that appeared on Earth have vanished.

C.      Vanished are nearly 99 percent of the five hundred million different species of living creatures that appeared on Earth.

D.      Of five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent of them have vanished.

E.       Of the five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent have vanished.

为什么选Ｅ呢？　Ｂ又错在哪里了呢？