a. Most slaves shipped across the Atlantic worked in the sugar colonies of Brazil and the Caribbean.
d. The invention of the cotton gin made cotton farming profitable and increased the demand for slaves.
The Atlantic slave trade meant transportation by slave tradesmen of enslaved African people. The slave trade usually used the triangular trade route and its Middle Passage, between the 16th and the 19th centuries. Most slaves were people from central and western Africa, who had been purchased by Western European slave traders from other West Africans.
The three best options from the list would be "d. The invention of the cotton gin made cotton farming profitable and increased the demand for slaves" and "b. Most North American slaves harvested sugar, as well as rice, tobacco, and indigo," and "<span>a. Most slaves shipped across the Atlantic worked in the sugar colonies of Brazil and the Caribbean," since C is incorrect because far more slaves worked in the South than in the North. </span>
