The slave trade became prominent along the Indian Coast. Where were most of these
slaves sent?

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Explanation:

The Indian Ocean slave trade, sometimes known as the East African slave trade, was the multi-directional slave trade and has changed over time. Africans were sent as slaves to the Arabian Peninsula, to Indian Ocean islands (including Madagascar), to the Indian subcontinent, and later to the Americas.

the answer is use of support  

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.