大家帮忙看看gwd-8-34

我想问问大家 gwd-8-34题 可是我当的是pdf版的 好象不能复制 哪个好心人帮我粘一下 然后告诉我为什么要选E 啊 我选的是A   可大家添麻烦了 不好意思!

GWD-8-Q34: GWD-13-28

Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.

1. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of

2. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on

3. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of

4. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on

5. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of

d，主谓一致，A中的it指代不清

e肯定不对吧。。。。。。