Which of the following scientific or technological breakthroughs did not occur within the first fifteen years of the 1900s?

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Albert Einstein introduced the theory of relativityWireless signals were transmitted across the Atlantic OceanThe development of the internetThe first successful powered airplane flightNone of the above

Explanation

Albert Einstein formulated the theory of relativity, wireless communication was established across the Atlantic, and the Wright brothers invented the airplane all within the early 1900s. However, the internet was developed much later during the mid-to-late 20th century, well after the first fifteen years of the twentieth century.