OG12 13题请教！

13. In Swartkans territory, archaeologists discovered charred bone fragmentsdating back one million years. Analysis of the fragments, which came from avariety of animals, showed that they had been heated to temperatures no higherthan those produced in experimental campfires made from branches of white stink wood,the most common tree around Swartkans.
Which of the following, if true, would,together with the information above, provide the best basis for the claim thatthe charred bone fragments are evidence of the use of fire by early hominids?
(A) The white stinkwood tree is used forbuilding material by the present-day inhabitants of Swartkans.
(B) Forest fires can heat wood to a rangeof temperatures that occur in campfires.
(C) The bone fragments were fitted togetherby the archaeologists to form the complete skeletons of several animals .
(D) Apart from the Swartkans discovery, there is reliable evidence thatearly hominids used fire as many as 500,000 years ago.
(E) The bone fragments were found in several distinct layers of limestonethat contained primitive cutting tools known to have been used by earlyhominids.
答案：E

My question is：文章让加强的是“ the charred bone fragments are evidence of the use of fire by early hominids”。但是E选项的意思是证明了early hominids用过primitive cutting tools，这句能证明他们use fire吗？是不是有些牵强啊。
另外想说一点，这个题到底是什么意思呢？是想证明early hominids用火把自己烧了吗？哈哈，笑死我了。不好意思，也许是我理解错了。求解释！3ks a lot！