How Did Alexander Graham Bell's Telephone Revolutionize Both Communications and Business

Multiple Choice

How did Alexander Graham Bell's telephone revolutionize both communications and business in America?

A) He had an instant monopoly on the communications market when he combined telephone and telegraph services in AT&T.
B) He installed telephones in every office building in New York to facilitate communications between business and the stock exchange.
C) He used a complicated organizational structure in his new company that allowed both local and cross-country communication.
D) He sold the rights to his invention to John D.Rockefeller,who put it into national use.