According to evidence from biological anthropology, changes in hominid use of stone tools were linked to what?

Question

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Evidence from biological anthropology suggests that changes in hominid use of stone tools were closely linked to evolutionary expansions in brain volume. As hominids developed more complex tool-making techniques, they needed larger and more sophisticated brains to plan, coordinate, and execute these activities. Thus, changes in tool use were both driven by and contributed to the evolution of larger brains, which became a hallmark of the Homo lineage. Evolution of bipedalism (A) and handedness (C) are important milestones in hominid evolution, but they are not as closely linked to changes in tool use as brain evolution is. The origin and development of language (D) is still a matter of debate among anthropologists, and there is no conclusive evidence tying this to changes in tool use.

According to Evidence from Biological Anthropology, Changes in Hominid Use