The Key Paleoanthropological Discovery Made at the Site of Laetoli

The key paleoanthropological discovery made at the site of Laetoli, in Tanzania, was of:

A) the fossil skeleton of "Lucy" dating to approximately 3 million years ago
B) the oldest anatomically modern human fossil dating to approximately 100,000 years ago
C) the oldest tools made by our hominin ancestors, dating to about 2.5 million years ago
D) a 23-meter-long trackway of human-like footprints dating to more than 3.5 million years ago

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