Answer:
D. changes in tools indicate changes in the toolmaker.
Step-by-step explanation:
The statement that stone tools “signal the pace of change in human prehistory” means that changes in tools indicate changes in the toolmaker. The Stone Age is the period of human prehistory in which humans began to make stone tools. These tools can make anthropologists figure out how humans lived, what they ate and what they hunted. One of the first tools was the hammerstone which was used to break bones or to separate meat from the marrow. It was also used to make sharp tools like axes and spear-points for hunting.