Complete the sentence with the correct year: By ______, just before the outbreak of World War II, this had grown to an estimated 35.1 million.

Answer and explanation

Correct answer: A. 1939

  1. Step 1: By 1939, just before the outbreak of World War II, this had grown to an estimated 35.1 million. Answer: 1939. Why not the others: 1929, 1942 and 1936 don't fit.

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