In the fifth paragraph, the author suggests that the steam engine used in earlier aircraft had failed because-
A. they were too small to power a large plane.
B. they were too light to generate enough power.
C. they did not have internal combustion power.
D. they did not have enough power to lift their own weight.
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সঠিক উত্তরঃ
D.
they did not have enough power to lift their own weight.
Explanation:
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