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What is the approximate chronological order of discovery for 'Ardi', 'Lucy', and Richard Leakey's *Homo erectus* finds, from oldest to most recent in evolutionary time?.
- A.Lucy, Ardi, Richard Leakey's finds
- B.Richard Leakey's finds, Ardi, Lucy
- C.Ardi, Lucy, Richard Leakey's finds
- D.Ardi, Richard Leakey's finds, Lucy
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