单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. What is wrong about the difficulty these Chinese encountered

A.They were blamed for working for lower wages and taking jobs away from white men.
B.Anti-Chinese riots broke out everywhere.
C.Chinese were barred from using the courts.
D.They were barred from becoming American citizens.