Here are the answers to your questions:
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A. Between the Sahara desert and major rivers - The empire of Ghana was strategically located between the Sahara desert and the major rivers, which facilitated trade.
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A. He made a pilgrimage to Mecca - Mansa Musa became known in Asia, Europe, and other parts of Africa primarily due to his extravagant pilgrimage to Mecca, which displayed the wealth and influence of Mali.
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C. Salt and gold - The main basis for the trans-Saharan caravan trade that built the empire of Ghana was the trade in salt and gold.
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D. Islam - Timbuktu and Djenné became centers of learning in the Songhai Empire mainly due to the influence of Islam, which promoted education and scholarship.
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A. Swahili coast - The Swahili Coast civilizations traded with India during the 1400s, engaging in trade across the Indian Ocean.