Which of the Following Is a Possible Conclusion to Be

Which of the following is a possible conclusion to be drawn from the discovery of obsidian glass in sites throughout Africa?

A) Obsidian can be found in abundance across the continent of Africa.
B) Early Homo sapiens exchanged goods and materials with one another across large distances.
C) Obsidian is a particularly durable material and found more readily than other artifacts left behind by early humans.
D) Obsidian was of little value, and early humans regularly discarded it.