1.  In which decade with the first transatlantic radio broadcast occur?

A. 1850s
B. 1860s
C. 1870s
D. 1900s

Answer: Option D

Explanation:

On December 12, 1901, a radio transmission received by Guglielmo Marconi resulted in the first transmission of a transatlantic wireless signal (Morse Code) from Poldhu, Cornwall, to St. John's, Newfoundland.