A. Sir Frank Whittle
B. Gottlieb Daimler
C. Roger Bacon
D. Lewis E. Waterman
Explanation:
Dr. Hans von Ohain and Sir Frank Whittle are recognized as the co-inventors of the jet engine. Each was working separately and knew nothing of the others work. Although Whittle started first, von Ohain was first to design and develop a turbojet engine to power an aircraft.
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