Final answer:
Yes, the statement is true. Lucy is a specimen of Australopithecus afarensis and her discovery has been vital for understanding the early stages of human evolution, particularly bipedalism.
Step-by-step explanation:
The statement that the famous fossil "Lucy" belongs to a group of Hominini that is called "Australopithecus" is true. Lucy is a well-known specimen of the species Australopithecus afarensis, which lived between 3.75 and 2.8 million years ago. Her remains were discovered in Ethiopia and are significant in the study of human evolution because they provide evidence of bipedalism. Australopithecus afarensis is thought to be a direct ancestor of later hominins, including those in the genus Homo, to which modern humans belong.