Silk routes are a good example of vibrant pre–modern trade and cultural links between distant parts of the world. Which one among the following is not true of silk routes ?

• A. Historians have identified several silk routes over land and by sea
• B. Silk routes have linked Asia with Europe and Northern Africa
• C. Silk routes existed before the Christian era and thrived almost up to the fifteenth century
• D. As a result of silk route trade, precious metals like gold and silver, flowed from Asia to Europe