Correct option is D
· The term Chalcolithic comes from the Greek words “chalkos” (copper) and “lithos” (stone).
· It refers to the Copper Age, a transitional period between the Neolithic (Stone Age) and Bronze Age.
· Communities in this era used:
· Copper tools
· Occasionally bronze (an alloy of copper and tin)
· Stone tools were also still in use.
· It marked the beginning of metal use in tool-making, but before widespread iron usage.