How does Ji-suk's mother best develop the theme that adapting to cultural change is difficult?

A. "...she made Ji-Suk take Korean lessons..."
B. "Her mother had spent years learning to speak relatively good English."
C. "...cooked kimchi and other Korean delicacies with her at least once a week..."
D. "...she's been determined to make sure Ji-Suk graduated from a respectable college and became a lawyer..."