For centuries, camel caravans carried incense, spices and silk across the deserts of Arabia, linking the markets of the Indian Ocean with those of the Mediterranean. A caravan might include hundreds of camels and travel for several months, stopping at oases where travellers could rest and trade. Towns that lay on the routes, such as Petra and Mecca, grew rich from the taxes and the business that the caravans brought. The routes declined when ships began to carry goods more cheaply by sea, but the history of the caravans is still remembered in the stories and place names of the region.

Answer and explanation

Correct answer: A. connecting

  1. Step 1: Linking the markets means connecting them.
Answer
connecting.
Why not the others: comparing, separating and replacing do not fit.

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