20 points! Why were goods traded between Europe and Asia so expensive when using overland trade routes?

A. There were many people involved along the way that all had to be paid enough to earn a profit.

B. Trade along the Sild Road was controlled entirely by Persia, which demanded a tax paid on all trade.

C. Trade along the Sild Road involved travel through dangerous Himalayan mountain passes that required paid guides.

D. Travel was dangerous, so families had to be compensated financially when members of trade caravans often died along the way.
Pls, answer ASAP.

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