Answer:
Immigrants were asked many questions before being allowed into the United States.
Step-by-step explanation:
Remember, the emphasis is on what best paraphrases the central idea of the excerpt. Hence our attention should be on what detail from the excerpt is most often stressed or elaborated on.
For example, from the excerpt, we observe an interesting detail that after the immigrants were asked several questions, "Some immigrants were so flustered that they could not answer." And the word "flustered" connotes one who is agitated or confused likely because of being asked several questions at a time.