Complete the sentence about Ernő Rubik with the correct year: By ______, Rubik's Cube was marketed throughout the world, and over 100 million authorized units were sold, mostly during its subsequent three years of popularity.

Answer and explanation

Correct answer: A. 1980

  1. Step 1: By 1980, Rubik's Cube was marketed throughout the world, and over 100 million authorized units were sold, mostly during its subsequent three years of popularity. Answer: 1980. Why not the others: 1965, 2005 and 1960 don't fit.

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