Read the following passage...

Câu hỏi: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.  

A. the urbanization in the United States in the nineteen century. 

B. the most important means of integrating immigrants into American society in the nineteen century. 

C. the industrialization and the bureaucratization of economic life the United States in the nineteen century.

D. the formal schooling in the United States in the nineteen century.