Respuesta :
The answer is D. Trade expanded and towns boomed.
Since A and B are definitely not the answer (Silk was brought from China, not the other way around and same goes for A)! C is also incorrect.
The answer is D. Trade expanded and towns boomed.
Since A and B are definitely not the answer (Silk was brought from China, not the other way around and same goes for A)! C is also incorrect.