We Know That in Antiquity,China Exported Silk Because No One

Multiple Choice

We know that in antiquity,China exported silk because no one in any other country knew how to produce this product.From this information we know that

A) China exported silk for political reasons even though it had no comparative advantage.
B) China had an absolute advantage,but not a comparative advantage in silk.
C) no comparative advantage could exist because the technology was not diffused.
D) China had a comparative advantage in silk.
E) China was unable to profit by exporting silk because it was unknown in the rest of the world.