PREP2-61

Researchers in Germany have unearthed 400,000-year-old wooden spears from what it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who systematically hunted big game much earlier than believed.

(A) it appears was an ancient lakeshore hunting ground as stunning evidence of human ancestors who

(B) it appears had been an ancient lakeshore hunting ground and is stunning evidence that human ancestors

(C) it appears to have been an ancient lakeshore hunting ground and is stunning evidence that human ancestors

(D) appears to be an ancient lakeshore hunting ground, stunning evidence that human ancestors

(E) appears that it is an ancient lakeshore hunting ground, stunning evidence of human ancestors who

对WHAT的句子比较感冒，答案是选对了，还是请帮我分析一下句型，特别是from以后的。多谢！

from后似乎应该是一名词结构，排除abe，c后面and弄成了what it ....and what is ....还是D比较简单，from后一名词结构，再一同位语还是名词结构。

我有一个问题，stunning evidence 作为同位语，至少也应该有a stunning evidence吧，单复数表示出来吧？