The correct option is B The origin of this route was at Xi'an in China.
The Silk Road was an ancient trade route that connected China with the West. It was a link between the two civilisations of Rome and China. It was established by the Han dynasty when it decided to initiate trade with the West.
The Royal Road, on the other hand, was established by the Persian ruler, Darius, nearly 300 years before the Silk Road was established.