The correct answer is B) people willing to work without pay for three to four years.
The statement that best defines an indentured servant is "people willing to work without pay for three to four years."
These indentured servants were people willing to work to pay their way to the American continent. Yes, as crazy as it could sound, these people worked for four to seven years for passage to the New World. They wanted to leave England and settle in the new world.
Indentured servants were not slaves, because they were able to stop working any time they decided to, but at that moment, the deal was done.