A Rock Carving from Ancient Norway Depicts Two Identical People

Multiple Choice

A rock carving from ancient Norway depicts two identical people doing different jobs in the same boat: one uses a bow to hunt while the other paddles. How does this early example illustrate the benefits of trade?

A) One prefers to hunt while the other prefers to paddle the boat; this is an example of diverse preferences.
B) One learns to be very good at paddling and one learns to be very good at hunting; this is an example of specialization and division of knowledge.
C) The paddler is stronger than the hunter so the paddler sacrifices a lot by hunting; this is an example of comparative advantage.
D) There is no trade in this example since no goods are being exchanged.