Final answer:
H. rudolfensis overlapped in time with Homo habilis and Homo erectus, as they all coexisted around 2 million years ago.
Step-by-step explanation:
H. rudolfensis is known to have overlapped in time with Homo habilis. These two species coexisted around 2 million years ago. At that time, Homo habilis had already been distinguished from earlier hominins like Australopithecus due to features such as smaller teeth, a more humanlike foot, and hand bones suggesting the ability to manipulate objects precisely. Evidence also indicates that both Homo rudolfensis and Homo habilis lived alongside Homo erectus, as this species appeared approximately 1.8 million years ago. Thus, the correct answer to which of the following hominins H. rudolfensis overlapped in time with is both a) Homo habilis and b) Homo erectus.