Answer:
I was confused by chosing between two first options but then I've realized which should be the right one. The only one option that suits to be the major cause of the post-war recession in the United States is the third: 3. transition from wartime production to peacetime production
Explanation:
B. Samuel Langhorne Clemens
Both islands required that immigrants pass health inspections is the resemblance between Ellis Island and Angel Island. Both of these islands were immigration stations. Ellis Island was located in New York Harbor while Angel Island was in San Francisco. These islands had very long process and medical exams.
D. is most likely the desired answer.