Which statement about slavery is true?
a. slavery was new to africa when the portuguese and spanish demanded slaves for work in the americas.
b. written records indicate that very few civilizations throughout history have accepted the idea of enslaving other people.
c. the first historically documented instance of slavery occurred in medieval europe.
d. slavery began in ancient times and has existed around the world in different forms.

The answer is letter D. 

Slavery began in ancient times and has existed around the world in different forms. Many evidences in Ancient Egyptian cultures tell stories of slavery in the building of colossal monuments of power. Other accounts are the first civilizations who used slaves to perform agricultural tasks and other forms of productions in their time. African Americans were also enslaved some time in history, being sold from one market to other. Native Americans were also enslaved during the colonization of the European society.

The answer is closed primary.