Those who failed to get past both doctors had to undergo a more thorough medical exam. The others moved on to the registration clerk, who questioned them with the aid of an interpreter: What is your name? Your nationality? Your occupation? Can you read and write? Have you ever been in prison? How much money do you have with you? Where are you going? Some immigrants were so flustered that they could not answer. They were allowed to sit and rest and try again.

What best paraphrases the central idea of the excerpt?
A. What is your name? What is your job? are examples of questions the immigrants answered.
B. Medical exams were frightening to the newcomers, so they had to sit down.
C. If they had ever been in a prison, the immigrants were not allowed to stay in America.
D. Immigrants were asked many questions before being allowed into the United States.