Like many assumption problems, this problem features an argument with a broad conclusion ("this hypothesis must be false") hanging precariously on one premise (essentially "there are no human fossil remains to support that hypothesis"). A helpful thing to keep in mind on assumption questions - and a reason that the Assumption Negation Technique can be so helpful - is that often the correct answer is necessary to keep the lone existing premise relevant.
Here's how that works
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Here's how that works
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