Answer
d. Homo neanderthalensis
Work Step by Step
Evidence has suggested that Neanderthals, Homo neanderthalensis, were able to speak to one another instead of just using vocalizations and gestures like Homo habilis and Homo erectus. None of the earlier hominin species had the modifications necessary for true speech; these adaptations include brain changes, modifications in the voice box, and the ability to control air flowing through the structures used in producing speech.
