A) is the correct answer, as many slaves were brought over from Africa due to being able to stand the southern heat for a long amount of time and being better built for farming.
B) isn't wrong, but there were less indentured servants than slaves, and white people did worse in the sun.
C) also isn't wrong, but many who tried using Caribbean slaves found that it was a lot worse than using African Americans, because the Native Americans weren't as built for manual labor.
D) is wrong because the wages for plantation workers weren't high, if they were even paid at all.
