Answer :
Final answer:
The Wright brothers' proposal for military airplanes was rejected by the U.S War Department in 1905 because there wasn't a visible demonstration of the airplane.
Explanation:
The Wright brothers, pioneers in aviation, experienced a significant event in their journey in 1905. They submitted a proposal to the U.S. War Department to build military airplanes. However, the U.S. War Department rejected their proposal this year because there wasn't a visible demonstration of the airplane. This event marked an important moment in their journey, but it did not discourage them. They continued their work and finally demonstrated their first successful powered flight in 1908.
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The Wright brothers were indeed rejected by the U.S. War Department because their airplane wasn't visibly demonstrated. This rejection occurred in c) 1908.