Answer:
D. Indentured servants were freed after a set number of years.
Step-by-step explanation:
Indentured servitude was a form of cheap labor that was very common in colonial America. The settler had a lot of lands to take care of but they did not have people to take care of it. So they developed the system of indentured servitude to attract people and workers.
The servants went to America and worked on the land in exchange for the passage, room, board, lodging and freedom dues. They did not have a lot of liberties but they had a few rights and more protection than a normal slave would have.
After they worked a certain amount of time the servants received their freedom package, some of them even were able to rise and become a part of the colonial elite.