They are pulled between the traditions of their parents' culture and the changes required by a new culture.
I think this statement can best support a situation in a text about the children of immigrants. It is because they are stuck between their parents's culture, traditions and conventional way of living and the new evolving culture that they presently are living in.
Even the different generations living in the same place as their ancestors have so much uncommon in their lifestyle in comparison to that of their parents and grandparents so it really does influence them a lot when they get to live in a foreign place with a completely different culture.
For part B, I think 'Ji-Suk wonders about her son's preference for friends rather than activities.' supports the answer to part A.