Refer to the map. Map of Trade Routes and World Religions in the Late 15th Century. A key notes Islamic areas, Christian areas, Buddhist areas, and Trade routes. Most of Europe and parts of Africa are Christian. Africa, the Middle East, and parts of Russia are Islamic. China, Japan, and other east Asian countries are Buddhist. Trade routes are marked with solid lines. Which of the following contributed to the development of the trans-Saharan routes shown in the map? The rise of accessible river cities such as Timbuktu

The arrival of desirable trade goods from the Red Sea

Climate shifts that reduced desert vegetation coverage

The spread of camels that could travel farther without water

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