Answer: They knew slavery was wrong but were driven by greed.
Explanation: I was going to pick the last option but you said it was wrong so I decided to go for the second best. I chose this answer simply because the other two above did not make sense. If they were willing to negotiate with Tubman then why would she fear of them hanging her, and the plantation answer has nothing to do with the paragraph or the consequenses of what would happen to the slaves who were fleeing.