Which one of the following best describes the main topic of the passage? A. the contribution of the Korean American community to improving the working conditions of Koreans employed by United States companies B. the change brought about in the Korean American community by contacts with Koreans visiting the United States C. the contribution of recent immigrants from Korea to strengthening ethnic identity in the Korean American community D. the effects on the Korean American community of a dispute between Korean union workers and a United States company E. the effect of the politicization of second-generation Korean Americans on the Korean American community as a whole