That would be D the gramicological errors were unmistakable
To connect his identity to the kiowa people as a whole
The answer is the amputation of the lieutenant's arm. None of the other options are events in the story. The lieutenant returns home and we don't know the outcome of the battle. There is also no evidence he was ever ill.
It is reasoning logically from the cause to the effect and the general to the specific
i.e.
the attached picture