Look at the map below. which of the following describes the relationship between location a and location b from the 1500s to the 1800s

The appropriate answer is D. Millions of slaves from location B were transported to location A. Location A, the Caribbean, was colonized by European countries such as Britain, Spain and France. They established plantations to exploit the fertile soils of the Caribbean island. In order to provide cheap labour for their endeavours, the remove millions of slaves from location B, West Africa.
The system came to be known as the Trans-Atlantic slave trade.