a) Etienne Lenoir
b) Nikolaus Otto
c) John Barber
d) John Stevens
Answer: b
Explanation: The first commercially successful internal combustion engine was created by Etienne Lenoir around 1859. John Baber developed a turbine in 1791. In 1798, John Stevens designed the first American internal combustion engine. Nikolaus Otto created the first modern internal combustion engine in 1876.
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