Answer:
A. He was afraid that white people would not buy his book if he wrote positively about Native Americans.
Explanation:
They valued family, I believe.
Tone in fiction is the attitude of the narrator or viewpoint character toward story events and other characters. In a story with first-person POV, tone can also be the narrator’s attitude toward the reader.
In non-fiction, tone is the writer’s attitude toward subject matter and reader. So the writer might come across as a know-it-all or a blowhard or as humble or solicitous.