What was prominently displayed at the Centennial Exposition?

The Centennial Exposition, held in 1876 to celebrate the 100th anniversary of the United States, prominently featured several technological innovations of the time, but one of the most notable was Alexander Graham Bell's telephone. The telephone was a groundbreaking invention that showcased the advancements in communication technology. At the exposition, Bell demonstrated the device, which generated immense public interest and ultimately led to the commercialization and widespread adoption of the telephone, revolutionizing how people communicated.

While the lightbulb and the airplane are significant inventions associated with Thomas Edison and the Wright Brothers, respectively, they were not prominently displayed at the Centennial Exposition. Edison's lightbulb gained attention in later expositions, and the Wright Brothers' flight occurred in 1903, well after this event. The first automobile was also still in its nascent stages during the time of the exposition and did not have the same level of impact or visibility as the telephone at this particular event. Hence, the choice highlighting the telephone aligns best with the historical context of the Centennial Exposition.