Part A: The piece of iron most likely symbolizes
C. his father's distrust of white people.
Part B: The quotation that most clearly supports this answer is
A. He did not understand his vision of finding something belonging to the white people, for in that time they were the enemy. (paragraph 64)
This quote highlights the conflict and distrust between the indigenous character and white people at that time, which aligns with the symbolism of the piece of iron.