Chief joseph’s tone in "an indian's view of indian affairs" can best be described as

forward and blunt.

angry and sarcastic.

heartfelt and sincere.

neutral and nonchalant

Chief Joseph’s tone in "An Indian's View of Indian Affairs" can best be described as C. heartfelt and sincere.
He is quite honest about his opinions that he is sharing with his audience and you can see that he honestly does speak from his heart about the whole Indian affair. That is why C is the correct answer here, as the other options are quite negative, which isn't the case here.