Answer:
C. a euphemism for “mixed race” to demonstrate a feeling of struggle within herself
D. “the borders of culture were nullified by the greater instincts of humanity to remember and to give honor”
Explanation:
A euphemism is a word or expression used instead of another word or expression that may be found offensive or suggest something unpleasant.
Race has always been a sensitive topic, so the narrator uses the figure of speech the strands of my mixed heritage instead of saying that she is multiracial (mixed race). This is how she tells us about the feeling of struggle within herself.
The quote that best supports this meaning is: ... the borders of culture were nullified by the greater instincts of humanity to remember and to give honor. This is the only quote making it clear that she is talking about culture and race.