The correct answer is letter B
Laetoli's footprints were left 3.5 million years ago where today is Tanzania, East Africa. It is the oldest evidence of a bipedal hominid, that is, walking upright under two legs. They were Australopithecus afarensis, with a monkey-like face, low forehead, flattened nose and large jaws. The height of an adult was around 1.40 meters. Hence your 18 cm foot looks so small. The perfect preservation happened thanks to the eruption of a volcano in the neighborhood. A rain turned the ashes into a kind of layer of fresh cement. Then the two Australopithecus arrived, leaving their feet perfectly designed for about 70 times.
