Answer:
The premises are plausible, that is, must have good reason to believe that the premises are true.
Explanation:
Hope this helps!
I think Marley means that to him it was not just business he felt like it was his duty to help mankind because when e states that "BUSINESS! Mankind is my business" he was trying to say that to him it didn't feel like a job it felt like his duty or his was of paying back to the world. He didn't feel like he had to but he wanted to.
Hope this makes sense...
Thanks for the points lol