Where did many of the slave traders set up their trading posts?

A) along the East African coast

B) along the Caribbean coast

C) along the Mediterranean coast

D) along the West African coast

A / Along the East African coast.

The correct answer is D. along the West African coast

That is because the buyers from Europe could go to West African coasts and trade their merchandise for slaves which could then be taken to the Americas. The slavers would capture people inland and then transport them to the coast for sales in huge markets.