Directions: For the following question, choose the option that fills up the blanks most correctly.

After the First World War, a large decrease in Mexican immigration to the United States occurred because the wartime _________ of immigration restriction was _________.

The first part of the sentence says that, after the First World War, the Mexican immigration to United States decreased sharply. So, the two missing words should together mean that the immigration restrictions had been relaxed during the War, and had become stricter after the War. (1) is the correct answer because, if wart-time waiver of immigration restrictions had been rescinded after the war, the rate of immigration would naturally have decreased in the post-war period.