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A) can be eliminated
B) this answer choice, if true, would weaken the claim that the charred bone fragments are an evidence of the use of fire by the early hominids. Because, it is giving an alternative explanation (charred bone fragments could have been the result of a forest fire rather than of the use of fire by early hominids).
C) we already know from the text that these charred bone fragments come from a variety of animals. can be eliminated.
D) this choice does not answer the question whether early hominids used fire 1 million years ago or not.
E) the only possible solution.
We already know from the text that these charred bones came from animals. we also know that they were heated to high temperatures and most probably branches of trees in question had been used.
We only have to find the agents of the action. And only E gives the best choice.
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