The invention which came first was Radio option(d) is correct.
What is invention?
Invention is known to be as the art or an act of creating or generally producing by the mind of the imagination in the certain period especially in the place of the art or music.
It was radio which was earlier invented in the 1890s before the atomic bomb, film with sound and the polio vaccine which was invented in the earlier 1900s.
Therefore Option(d) is correct as it was earlier invented.
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