How is the central idea proven? It's on "The Immigration Contribution" by John F. Kennedy

From which of the following literary works is this quotation most likely taken?

Members of the common school movement believed that

Which of the following statements os an example of how climate and vegetation influence lifestyles? a. many south koreans enjoy watching american films and listening to american music.b. many mongolians are pastoral nomads who raise livestock for a living.c. many chinese peasants are moving to cities in search of better jobs opportunities.d. many north koreans wish to see relatives now living in korea.