Why did the chinese trade silk for horses from ferghana? what did emperor wi-ti think of them

The main transport at that time was Ferghana's horses and horses had a very high quality and Wi-ti loved them and wanted very much them, but to obtain horses of such high quality, it was necessary to exchange for a product of similar value , in this case, the Chinese silk.

In the distant past, the Chinese have learned how to make silk from the white fiber of the cocoons of silkworms. Only the Chinese knew how to manufacture it, and they kept this closely guarded secret. When they made contact with the cities of the West, they found people willing to pay dearly for the silk.

i believe the answer to your question is b. pay your bills early

by improved communication.