"Lucy's Baby," an Important Au

"Lucy's Baby," an important Au. afarensis fossil from northern Ethiopia, includes a complete skull, mandible, and face. What is an important outcome of this find?

A) It has a human-like skull and upper body, unlike Lucy.
B) It indicates that Au. afarensis had a prolonged childhood period of slow brain growth.
C) It was found to have a large cranial capacity but was not bipedal, drawing into question how these traits develop in childhood.
D) It sheds light on growth processes in human ancestors, including brain and dental development.
E) It is the first fossil hominid child found alongside its mother.