The correct option is:
B. Slavery soon became less important in the Americas and most slaves were freed.
Slavery was strongly laced with the national economy and vigorously defended by white Southerners, who were profiting from enslaved labor. By the 19th century, abolitionism, a campaign to end slavery, gained strength as many abolitionist, most of them in the North, worked tirelessly to promote awareness about the evils of slavery, and to raise support for abolition.
