If Marks Found on Fossil Animal Bones from Dikika Were

If marks found on fossil animal bones from Dikika were determined conclusively to have been made by stone tools,

A) we would conclude that P. boisei was the first toolmaker.
B) chipped stone tools were made and used much earlier than previously thought, possibly by A. afarensis.
C) A. garhi was hunting animals a million years earlier than previously thought.
D) H. habilis was the first toolmaker.