I think the answer is B. The soldiers carried whichever flag belonged to their country.
The central conflict in the story "Two Kinds" by Amy Tan is mother's wishes vs. daughter's will.
The mother wants her daughter to play the piano in order to become a prodigy, whereas the daughter, Jing-mei initially wants to do it, but later on changes her mind, which makes the conflict of the story.
0-2 I think owowowwoowwoow
C. because their and girls are both plural so that means they complete each other.