Bipedalism in ancestral hominids is believed to have started
A. 3.4 million years ago, with A. afarensis aka "Lucy"
B. 4.4 Million years ago with A. ramidus aka "Ardi"
C. 6-7 million years ago with S. tchadensis aka as "Toumai"
D. 8 million years ago with the divergence of P. troglodytes aka "Oliver"