Basically, it was bringing gain (money) to the people who profited from it.
Slaves were cheaper than other labour and needed on the plantations: they brought profit to their masters and this profit could be "invested" into buying more slaves.
I would say a because the land is fertile which helps with farming
Biological perspective best explains the complexities of human behavior
Answer: This is an example of DISPARATE-IMPACT DISCRIMINATION.
Explanation: Disparate-impact discrimination can be defined as a discrimination that occurs without the intentions of the entity to discriminate. It can be said to be unintentional discrimination. This discrimination occurs when policies, practices, rules or other systems that appear to be neutral result in a disproportionate impact. Like Homer, rightly believed, "an unintentionally discriminatory effect" the test was a way to discriminate between individuals that have a particular knowledge or set skill Origami Paper Products Corporation requires.