Which explains why African slavery was introduced to the Americas?

A.
The Spanish conquered Africa and took millions of Africans as slaves.

B.
A potato famine in Africa forced millions of starving Africans into slavery.

C.
The Native American population was reduced and African slaves were needed to work the sugar plantations.

D.
The Spanish needed a large army to defeat the Native Americans, and African slaves were immune to New World diseases.
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