To answer this question, we need to understand when the first transatlantic radio broadcast occurred.
Option A) 1850s - This option is incorrect because the first transatlantic radio broadcast did not occur in the 1850s. During this time, radio technology was not yet developed enough for transatlantic communication.
Option B) 1860s - This option is incorrect because the first transatlantic radio broadcast did not occur in the 1860s. Radio technology was still in its early stages of development during this decade.
Option C) 1870s - This option is incorrect because the first transatlantic radio broadcast did not occur in the 1870s. While there were advancements in telegraphy during this time, transatlantic radio communication was not yet achieved.
Option D) 1900s - This option is correct because the first transatlantic radio broadcast occurred in the 1900s. Specifically, the first transatlantic radio transmission took place on December 12, 1901, when Guglielmo Marconi successfully transmitted a radio signal across the Atlantic Ocean from Poldhu, Cornwall, in England to St. John's, Newfoundland, in Canada.
The correct answer is D. The first transatlantic radio broadcast occurred in the 1900s.