The correct answer is A. The Silk Road changed to reflect changing political borders and power structures.
The Silk Road was not a single, fixed route but rather a network of trade routes that evolved over time due to various factors, including the rise and fall of empires, the establishment of new political boundaries, and changes in trade routes driven by economic needs and geographic considerations. Different empires, such as the Persian Empire, the Roman Empire, the Byzantine Empire, and later the Mongol Empire, each exerted influence over parts of the Silk Road at different times, which affected trade practices, cultural exchanges, and the movement of goods and people. As political landscapes shifted, the routes used by merchants would also adapt accordingly.