The Indigenous Civilizations of the Americas Relied More on Stone

The indigenous civilizations of the Americas relied more on stone for their everyday tools for longer than other parts of the world because:

A) they were less innovative.
B) they did not have the raw materials to make bronze.
C) they were peaceful and did not need the bronze for weapons because they had eliminated warfare.
D) of the ready availability and suitability of obsidian.
E) the civilizations of the Old World were more creative than the civilizations of the New World.