Complete the sentence about John von Neumann with the correct year: On February 20, ______, Emperor Franz Joseph elevated John's father to the Hungarian nobility for his service to the Austro-Hungarian Empire.

Answer and explanation

Correct answer: D. 1913

On 20 February 1913 Emperor Franz Joseph raised von Neumann's father to the Hungarian nobility for his service to Austria-Hungary. The family gained the hereditary name Margittai.

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