In what way are Australopithecus anamensis and Australopithecus sediba different from each other?

A) A. sediba has retained more ancestral characteristics than A. anamensis.
B) A. anamensis has retained more ancestral characteristics than A. sediba.
C) A. anamensis was fully bipedal while A. sediba was not.
D) A. sediba was fully bipedal while A. anamensis was not