C. jews, slaves, and gypsies from across europe were sent to concentration camps
These guys basically plucked from a handful of "sinful wrongdoers" that they believed were to be punished by their own god, and yet took things into their hands. They'd accuse any woman as of being a witch. A servant girl, a sick old lady married to her servant, a homeless begger. And so forth. They played the game telephone and spread lies about anyone and everyone resulting in innocents dying.
The answer for this question is B. seeing as it had nothing to do with black slaves to Liberia and the ocean passage was completely different and the Irish weren't involved at all
Hope this helps :)