B is wrong, but I believe C is right.
"If any man or any nation outside the Five Nations shall obey the laws of the Great Peace and make known their disposition to the Lords of the Confederacy, they may trace the Roots to the Tree and if their minds are clean and they are obedient and promise to obey the wishes of the Confederate Council, they shall be welcomed to take shelter beneath the Tree of the Long Leaves." -from the excerpt
Answer: C) They were willing....
Explanation: I know this the right answer