Answer:
The correct answer is: D. Lucy and Ardi are the oldest human ancestors found so far.
Explanation:
The hominid known as Lucy is an Australopithecus afarensis fossil which has been dated to be 3.2 million years old. Ardi, on the other hand is a Ardipithecus ramidus known to be at least 4.4 million years old. Together, these specimens are the two oldest human ancestors found to this date, and having both been found in the Afar Depression in Ethiopia, these fossils lead the scientific community to believe that human life started in the current region of Africa.