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Which scientific or technological advance did not take place in the first fifteen years of the twentieth century?

AAlbert Einstein's theory of relativity
Bwireless communication across the Atlantic
Cthe creation of the internet
Dthe invention of the airplane
Ethe mass production of cars

Verified Answer :

irinateleoaca

It's (c). I would say (b), too, but Morse code can be considered wireless if flashes are used to send messages.

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