Answer:
Correct answer is Europeans enslaved African people and brought them to American colonies to work.
Step-by-step explanation:
First option is not correct as debt bondage existed in the period of Ancient Rome for example, and in this period Europeans were not slaves, but slave-holders.
Second option is also not correct as not so many Native Americans were brought to Europe, especially not as slaves.
Third option is also not correct, as they would be put in prison for certain crimes.
Last option is correct as the trade was established on the line towards West Africa were the slaves were sold. They would be sent to Americas across the ocean.