The correct answer is A) People could communicate instantly over great distances.
The option that best describes the significance of the telegraph in revolutionizing communication is "People could communicate instantly over great distances."
Many people intervened in the development of the telegraph but Samuel Morse has been credited with this important invention that revolutionized the way people communicate at the time. It was in 1844 that Morse sent what is considered to be the first message through the telegraph. He sent it from Washington D.C: and was received in the city of Baltimore, Maryland.
