The automobile, the first commercial airline, and the first fully synthetic plastic were all innovations of the

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The first commercial airline, the St. Petersburg-Tampa Airboat Line, began operations in 1914. The first fully synthetic plastic, Bakelite, was created in 1907. The first automobile, the Benz Patent-Motorwagen, was invented in 1885, but it wasn't until the early 1900s that automobiles became more widely available and popularized. Therefore, the best choice is early 1900s.

The Automobile, the First Commercial Airline, and the First Fully