Final answer:
Lucy, a specimen of Australopithecus afarensis, is approximately 3.2 million years old. This is confirmed by radiometric dating and fossil analyses of the strata where her remains were discovered.
Step-by-step explanation:
The Australopithecus afarensis specimen known as Lucy is approximately 3.2 million years old. Lucy represents a critical piece in understanding human evolution. Radiometric dating of the geological strata in which Lucy's remains were found indicates that she lived roughly between 3.9 and 2.9 million years ago. Furthermore, specific evidence from different sources, including the stratigraphic context and fossil analyses, reconfirms that Lucy lived about 3.2 million years ago. Therefore, the correct answer to the question is A) Approximately 3.2 million years old.