Purpose Question. We have to sense the tone. The very last sentence of the passage contains a lot of author's tone. Besides, since it explicitly states that there is a lesson to be learned, the purpose it clear, and that's where we start looking.
Let's get into answer choices.
A) Passage does deal with what happened in Korean American community, but it's effect on other communities has not been covered.
B) Referring back to 58-63, "empowerment of ethnic communities of immigrant derivation" is indeed the issue that the author is trying to focus on via Korean American Pico struggle. Correct
C) Detailing the problem by Korean American community is not the issue. Out of scope.
D) Nope. Economic and Social injustice is not the issue. Sense of community despite the difference and empowering ethnic communities of immigration derivation is the issue.
E) Unionization is not the major issue the author is dealing with. It’s just a catalyst. What happened after that is the major concern.